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Thread: Distance measurement

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    Subscriber Member tashley's Avatar
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    Distance measurement

    We all know that DOF is a moveable feast. I, for example, have a new DOF calculator on my iPhone called TrueDoF-Pro which lets you set really anal-retentive parameters, such that at F5.8 on a Rodenstock 40 and IQ180, if you want to make a one metre wide print with 10LP/MM resolution, you know that you hyperfocal distance is 40 metres and that everything from 18m out will be good. Or, if you prefer, you can state a blur spot preference of 41 microns and know that your 'traditional' DOF is from 3.5 metres outwards if you focus at 7 metres. Etc etc. etc.

    But I still want to focus really accurately sometimes, more accurately than focus mask can achieve and without all the difficult iterations of 'suck it and review on the LCD'.

    SO I would like a rangefinder. But the good ones like the Leupold and the Leica Disto 5 seem to have restricted ranges of operation. As far as I can see, they both offer a minimum of 10 metres and a maximum that depends on target type but might be as little as 100metres or as much as 1000.

    The HPF focus ring on my lens tops out at 52.7metres, which is a tiny nudge from infinity. But there's really quite small distance between that scale marking and 10.6 metres and then suddenly there are acres of space for everything under 10 metres - exactly the zone where laser finders seem to stop.

    So, short of a tape measure (which would make me feel like an 1880's practitioner) can anyone suggest something as accurate as the HPF ring which works from let's say 1/2 metre and outwards?

    I tried at Nikon 1000AS in the shop today and thought it seemed really nice and seems good value but again, it is a ten meter only option.

    Thanks in advance!
    Tim

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    Re: Distance measurement

    I don't know anyone who uses one, but carpenters' lasers have much closer ranges.

    See, e.g., Bosch Dlr130K Laser Distance Measurer

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    Senior Member danlindberg's Avatar
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    Re: Distance measurement

    My Disto 5 has a close range of 50 cm! Between half a metre and ten metres I use it without exception.
    I have it mounted on any of my Alpa bodies with one calibrated offset for the traditional bodies and another for the FPS. I use the smallest ballhead on the market and is easy to manoeuvre and when on target I fix it rigid and take the reading. Works splendid!

    Here on the SWA.

    Alpa FPS • MAX • TC | Alpagon 32Hr | Helvetar 75 | Schneider 120N | Leaf Aptus II 5 • Leaf Credo 60 | www.danlindberg.com
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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    the good ones like the Leupold and the Leica Disto 5 seem to have restricted ranges of operation. As far as I can see, they both offer a minimum of 10 metres and a maximum that depends on target type but might be as little as 100metres or as much as 1000.
    The Leica D5 has a minimum distance of 5cm.

    http://www.leica-geosystems.de/downl..._manual_us.pdf

    (the technical data is in a table towards the end of the manual.)

    Chris

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    Administrator, Instructor Guy Mancuso's Avatar
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    Re: Distance measurement

    Quote Originally Posted by danlindberg View Post
    My Disto 5 has a close range of 50 cm! Between half a metre and ten metres I use it without exception.
    I have it mounted on any of my Alpa bodies with one calibrated offset for the traditional bodies and another for the FPS. I use the smallest ballhead on the market and is easy to manoeuvre and when on target I fix it rigid and take the reading. Works splendid!

    Here on the SWA.

    Off Topic. What tripod head is that Dan
    Photography is all about experimentation and without it you will never learn art.

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    Subscriber Member tashley's Avatar
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    Re: Distance measurement

    Thanks guys, I read a retailer website that said it was 10 metres, my bad. Jae Moon said in another thread, though, that he couldn't get it to work much beyond 45metres s it'll be fine for use with the Rodie 40 but not if I go longer eventually.

    Guy, I think that's an Alpa micro leveller. Looks nice but weighs nly a touch less than a cube and has less movements.

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    Re: Distance measurement

    Guy, do you want to find out? Next you will ask about the price, and then...

    It is a bottomless pit.

    The head is from Linhof--3D Macro.

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    Re: Distance measurement

    LOL

    Its worse than a bottomless pit. Thanks Ill check it out
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Senior Member danlindberg's Avatar
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    Re: Distance measurement

    Quote Originally Posted by Guy Mancuso View Post
    Off Topic. What tripod head is that Dan
    Indeed, as has already been answered. Linhof 3D Micro. Nice and sturdy but only for levelling, not for creative angles

    The tiny tiny ballhead for the Disto is a Cullmann CB2, weighs nothing...

    And yes, the Disto measures closer than my stated 50 cm!!!
    Alpa FPS • MAX • TC | Alpagon 32Hr | Helvetar 75 | Schneider 120N | Leaf Aptus II 5 • Leaf Credo 60 | www.danlindberg.com

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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    Jae Moon said in another thread, though, that he couldn't get it to work much beyond 45metres
    It's a problem you don't run into if you do interior photography :-)

    But I tried it outside and while I can't remember exactly at which distance it stopped working - above 50m it became problematic in daylight. So I can confirm what Jae Moon said ...

    Chris

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    Re: Distance measurement

    I have used the Leica Disto for quite a while and up to distances of 200 feet it is flawless. At longer distances is does require a good target and it must be on a tripod or some type of level device for stability. I trust it completely and it has never failed me...... I just set the HPF ring to whatever the Disto indicates.

    Victor

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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    So, short of a tape measure (which would make me feel like an 1880's practitioner) can anyone suggest something as accurate as the HPF ring which works from let's say 1/2 metre and outwards?
    I use a Leica Disto A3 (the model I use is not available anymore but there is certainly a successor). It starts at 5 centimeters and goes to around 100 meters. By the specs it is not preferable for use in bright sunlight at long distances... but I've only encountered an error message once - when I measured a white wall in full sunlight. I then pointed the Disto to measure the bottom right in front of the building and it worked fine ...

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    Re: Distance measurement

    When talking about shooting in the usual f11 region, are these types of laser measurement devises really needed with wide lenses like the RS40HR-W?

    Has anyone ever tested being off by say a meter and using hyper focal against nailing the focus to the millimetre and compared the final sharpness between the two?

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    Re: Distance measurement

    Quote Originally Posted by gazwas View Post
    When talking about shooting in the usual f11 region, are these types of laser measurement devises really needed with wide lenses like the RS40HR-W?

    Has anyone ever tested being off by say a meter and using hyper focal against nailing the focus to the millimetre and compared the final sharpness between the two?
    it depends on how critical you are about focussing. Printed at native pixel size at 300 or 360ppi you maybe won't notice a really large difference. But once you start to uprez your captures to print big you'll see it (not as pronounced as at 100% magnification on a monitor screen... but the impression is pretty similar).
    I'd say you clearly see whether the shot was focussed at 25 or 30 meters distance even at f11 (talking about the Digitar 43XL... which should be similar to the 40HR). The reason is that the micro contrast in the plane of focus is extremely high (it get's evened out a bit once you hit diffraction). And since 25 and 30 meters is pretty close to the infinity setting on the lens you just have to softly touch the focus ring to make this adjustment. I am exaggerating a bit... but yes, these laser distos are really, really helpful.

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    Re: Distance measurement

    Guy,

    Quote Originally Posted by Guy Mancuso View Post
    ...Ill check it out
    I previously investigated the head. My understanding is that:

    a) The Linhof gear pitch is finer and hence the head offers greater control than the Arca Cube, albeit the range of rotation is not as large as the latter (hence the reason Linhof refers to it as a "levelling head"
    b) The two geared axes work perpendicular to the Cube's axes. In other words, turning the side axle rolls the head left/right, whereas with the Cube it pitches forward/back - Dan, please correct me if I am mistaken

    Food for thought.

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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    We all know that DOF is a moveable feast. I, for example, have a new DOF calculator on my iPhone called TrueDoF-Pro which lets you set really anal-retentive parameters, such that at F5.8 on a Rodenstock 40 and IQ180, if you want to make a one metre wide print with 10LP/MM resolution, you know that you hyperfocal distance is 40 metres and that everything from 18m out will be good. Or, if you prefer, you can state a blur spot preference of 41 microns and know that your 'traditional' DOF is from 3.5 metres outwards if you focus at 7 metres. Etc etc. etc.
    great app tashley - thanks!
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    Subscriber Member tashley's Avatar
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    Re: Distance measurement

    Quote Originally Posted by photomgraphy View Post
    great app tashley - thanks!
    It's cool isn't it? I love the way it lets you specify print size and resolution, though the resulting DOF for a metre wide print is pretty much that there's NO DOF!

    The only irritating thing is that it doesn't actually telly uo the exact hyperfocal distance, just shows it on a scale. Otherwise it is the best I have yet found, though there is one more version above it that might be even better.

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    Subscriber Member tashley's Avatar
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    Re: Distance measurement

    And thanks for the info on the disto everyone!

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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    It's cool isn't it? I love the way it lets you specify print size and resolution, though the resulting DOF for a metre wide print is pretty much that there's NO DOF!

    The only irritating thing is that it doesn't actually telly uo the exact hyperfocal distance, just shows it on a scale. Otherwise it is the best I have yet found, though there is one more version above it that might be even better.
    the blur spot diameter = circle of confusion, right?
    so i set it to 40microns (39mpx hasselblad back)

    lp/mm for print resolution? how does this convert into ppi?
    are 10 lp/mm equal to 508ppi? if i assume, that one line is equal to one pixel...

    let's say my usual print size is 17x24 at 300ppi - what would i have to dial in to get that?

    i'm a littlebit confused by that.
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    Re: Distance measurement

    I've used the Disto and some other laser distance meters. You really need the Disto D5 for outdoor work. You need the display to be able to direct the laser beam (you won't see the spot on longer distances when bright outside), and you need the quality of the Disto for it being able to pick up the reflection. Older/cheaper distance meters are not as good at taking reflections off tree trunks etc in daylight (they only work well indoors and/or flat surfaces like walls). Still there is some limitations with the Disto, getting a measurement off a bush can be difficult for example.

    I thought about getting a Disto D5 for my Linhof Techno system but I ended up with a vintage Leitz Fokos rangefinder, very small optical unit, no batteries. Not at all as accurate as a laser finder of course, but fits very well the more relaxed focusing style used with a view camera (which I find adequate, I'm not really missing HPF, especially since I use tele and tilt a lot).

    For an Alpa with HPF ring high focusing precision is part of the concept and then I'd see the Disto D5 as an almost mandatory accessory.

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    Re: Distance measurement

    i have both the distto 5 and the leupold and find myself preferring the leupold as to ease of use as long as the distance is greater than 15' (about 5 M) The laser dot of the disto get impossible to see outdoors in bright conditions, so i use the video screen and cross hair on the disco which works fine.

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    Subscriber Member tashley's Avatar
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    Re: Distance measurement

    Quote Originally Posted by photomgraphy View Post
    the blur spot diameter = circle of confusion, right?
    so i set it to 40microns (39mpx hasselblad back)

    lp/mm for print resolution? how does this convert into ppi?
    are 10 lp/mm equal to 508ppi? if i assume, that one line is equal to one pixel...

    let's say my usual print size is 17x24 at 300ppi - what would i have to dial in to get that?

    i'm a littlebit confused by that.
    You need to go into settings (cog symbol) and specify your print size. The 10 LPM default is probably perfectly adequate, since it is judged so for close viewing of a small print, but what specifying the print width does is ensure that the resolution doesn't drop as you print bigger. In other words, you can stay just as close to the print. But I am going to test this and see if it holds true. I will also experiment with 12 and 14LPM but you will notice that as you specify tighter resolutions, the DOF drops to almost nothing.

    COC wise I have been setting 41 microns for the IQ180.

    I think the answer is that, at root, DOF is about 'acceptable' focus and the word 'acceptable' means 'personal'. To that extent, this app seems to let you decide what that personal degree of acceptability is, with some default good guidelines. Thereafter it's going to be a tweak-athon!

    But the way I am looking at it is that 1 line pair = 2 pixels width. If I don't want to see individual pixels then I need to print at about 200 DPI or higher (I often make very large prints at 180 DPI so that's about right). That means that 1 line pair per mm = 2 pixels per mm = 51 pixels per inch. So 10 line pairs per mm, which is the default, = 510 DPI which is as you calculated... so I reckon that if you set 4 lppmm you will get about a 204dpi print, which is about the same as a 50% view on a 100 dpi monitor and about the lowest I will drop to in print. I will compromise on 5 lppm for now, close to 260 dpi and that should be enough for big prints even reasonably close up.

    To put it another way: the largest print I have made so far is 1.25 metres high. It looks really good even very close up. So let's say that's 50" wide.

    IQ180 resolution is 10328 pixels on the long side and that is a print resolution therefore of 206 dpi - the same as 4 lppmm if my math is right. So setting 5 should be absolutely fine, when using the largest print size.

    That means that with the Rodie 40 on the IQ 180 (and assuming a print size of 1 metre, which is the maximum allowed on the slider but remember I have chosen to use 5 lppmm rather than 4 so that should allow roughly 125% bigger print which takes me to my desired size) shot at:

    F5.6 the hyperfocal distance is a touch under 15 metres and that gives good focus from about 7.7 metres outwards.
    F8 it is about 11.5 metres and that gives good focus from about 5.8 metres outwards.
    F11, which is the absolute smallest aperture I would use (the calculator shows that at F16 diffraction ruins everything!) the hyperfocal is 10 meters and the near distance is 5 meters. I am going to write those values down and put them on a card!

    There! I don't need a Disto any more. But I'm going to get one ;-)

    Anyone who now wants to show me the errors in my calculation is extremely welcome!

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    Subscriber Member tashley's Avatar
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    Re: Distance measurement

    Quote Originally Posted by jlm View Post
    i have both the distto 5 and the leupold and find myself preferring the leupold as to ease of use as long as the distance is greater than 15' (about 5 M) The laser dot of the disto get impossible to see outdoors in bright conditions, so i use the video screen and cross hair on the disco which works fine.
    That sounds like a plan but, seeing my post above, I think that the Disto is right for me because hyperfocal calculations let me get everything in the longer range, at least with the Rodie 40, where I want them. Theoretically of course - we'll see how that works in the real world! So I am going for the Disto - which also looks like it will have uses for calculating tilt when I get my head around it! But it does imply that if your finder has a minimum distance of 10 metres then it only operates in the range where hyperfocal will carry the day.

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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    That sounds like a plan but, seeing my post above, I think that the Disto is right for me because hyperfocal calculations let me get everything in the longer range, at least with the Rodie 40, where I want them. Theoretically of course - we'll see how that works in the real world! So I am going for the Disto - which also looks like it will have uses for calculating tilt when I get my head around it! But it does imply that if your finder has a minimum distance of 10 metres then it only operates in the range where hyperfocal will carry the day.
    I thought you were going cheap and simple with baby steps at first Tim?

    You've not even been out on a real shoot yet with the new camera and you're already purchasing more stuff that you don't know you'll need and will probably sit unused in your camera bag?

    Just saying...........

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    Subscriber Member tashley's Avatar
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    Re: Distance measurement

    Quote Originally Posted by gazwas View Post
    I thought you were going cheap and simple with baby steps at first Tim?

    You've not even been out on a real shoot yet with the new camera and you're already purchasing more stuff that you don't know you'll need and will probably sit unused in your camera bag?

    Just saying...........

    In for a penny in for a pound old chum

    After a weekend shooting it seems that this system works for me in a way that the Cambo/35XL just didn't. It gives great images and with some niggles to be worked out, finally gives me the premium over a D800 that it should - especially when used with movements, at which point the D800 with 24mm PCE is left eating very dry dust...

    I have spent the morning working out DOF tables and tilt tables too. Using the arcsine method, rather marvellously, a tilt of exactly two turns of the knob on the Alpa adaptor, shot at my tripod's full height and with the lens focussed at infinity, gives me a perfectly sharp floor plane - which is a great starting point.

    I now need something interesting to shoot

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    Re: Distance measurement

    I'm glad to see you are happy with the IQ180, my friend. It's been a while
    I can't wait to see pictures from someone who is talent a you and to learn your experience with the tech cam.
    Pramote
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    Subscriber Member tashley's Avatar
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    Re: Distance measurement

    Quote Originally Posted by Landscapelover View Post
    I'm glad to see you are happy with the IQ180, my friend. It's been a while
    I can't wait to see pictures from someone who is talent a you and to learn your experience with the tech cam.
    Pramote
    Pramote, you are one of the very, very best photographers I know of - your way with composition and light and your ability to combine it with great technique, are something I can only aspire to. I can't see you learning from me, other than from my mistakes!
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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    Pramote, you are one of the very, very best photographers I know of - your way with composition and light and your ability to combine it with great technique, are something I can only aspire to. I can't see you learning from me, other than from my mistakes!
    The tear in my eyes hearing these words from someone like you!
    I am serious. I know lots of people at GetDPI feel the same way as I am.
    Coincidentally, I've just had the Alpa SWA for few weeks and been so excited about it. The craftsmanship is just incredible.
    Please post your experience with the STC and Rodie 40mm HRW (which I also have) so we can learn from you. Believe me the Disto D5 is fantastic you will love it. I carry it with me lots of time w/o a camera to train my eyes for the distance. It's a lot of fun to have
    I am very happy you happy
    Pramote
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    Re: Distance measurement

    Well, talking of learning from mistakes, one lesson from this weekend is don't let the top of your LCC card catch the sunlight from behind!

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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    Well, talking of learning from mistakes, one lesson from this weekend is don't let the top of your LCC card catch the sunlight from behind!
    Sometimes I was lazy with the LCC and just took B&W!

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    Re: Distance measurement

    Quote Originally Posted by tashley View Post
    Well, talking of learning from mistakes, one lesson from this weekend is don't let the top of your LCC card catch the sunlight from behind!
    Tim

    Can you please describe this a bit in more detail ?
    Regards . Jürgen .
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    Re: Distance measurement

    Quote Originally Posted by jotloob View Post
    Tim

    Can you please describe this a bit in more detail ?
    I guess he means that the LCC card propagates light from the sides so if you have strong light at it you might get uneven illumination. Similar problem you can have with square filters, you want them to be in shadow. If the light is coming from the front it is more likely that the card is evenly illuminated, while if it is coming from the back it is likely that the bottom part is in shadow and the top is brightly illuminated which might cause some uneven LCC.

    Rather than an LCC card I'd like to have an LCC lens cap (ideally with painted sides to avoid light coming in from the sides), which I could have one for each lens instead of the standard lens cap. Would be much more practical, but noone seems to have thought about that. Rodenstock / Schneider could provide it as an accessory.

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    Re: Distance measurement

    Quote Originally Posted by torger View Post
    I guess he means that the LCC card propagates light from the sides so if you have strong light at it you might get uneven illumination. Similar problem you can have with square filters, you want them to be in shadow. If the light is coming from the front it is more likely that the card is evenly illuminated, while if it is coming from the back it is likely that the bottom part is in shadow and the top is brightly illuminated which might cause some uneven LCC.

    Rather than an LCC card I'd like to have an LCC lens cap (ideally with painted sides to avoid light coming in from the sides), which I could have one for each lens instead of the standard lens cap. Would be much more practical, but noone seems to have thought about that. Rodenstock / Schneider could provide it as an accessory.

    Exactly right - you can get a bright patch at the top which throws the whole exercise off. And I agree about the LCC sheet: if they were push-on in the correct diameter with a felt-lined inner ring like a CV lens cap and they also made one with 4 stops ND so you could use it for quick LV focus in sunlight, I'd be happy as the proverbial pig!

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    Re: Distance measurement

    Quote Originally Posted by torger View Post
    Rather than an LCC card I'd like to have an LCC lens cap (ideally with painted sides to avoid light coming in from the sides)
    Sinar makes/made (?) something like this. Unfortunately, it's not compatible with Lee filter holders but it's done in a similar way:

    http://www.capturescanprint.com/_pic...ading_diff.jpg

    Chris

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    Re: Distance measurement

    Quote Originally Posted by cly View Post
    Sinar makes/made (?) something like this. Unfortunately, it's not compatible with Lee filter holders but it's done in a similar way:

    http://www.capturescanprint.com/_pic...ading_diff.jpg

    Chris
    Thanks Chris - that looks exactly right!

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    Re: Distance measurement

    Thank you .
    I have made a circumferential edge protection using black PVC insulation tape for the LCC card and experienced no trouble so far .
    Regards . Jürgen .
    -----------------------------------------------------------------------------------

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    Re: Distance measurement

    Quote Originally Posted by cly View Post
    Sinar makes/made (?) something like this. Unfortunately, it's not compatible with Lee filter holders but it's done in a similar way:

    http://www.capturescanprint.com/_pic...ading_diff.jpg

    Chris
    Thanks for the tips. But to be really smooth to use it would double as a lens cap and you would have one for each lens. Just like I have a cable release permanently attached to each lens to speed up workflow.

    Another alternative is to add step rings to all lenses so all get the same diameter so one could have a single lens cap that fits them all.

    Out in the field one wants to have small practical things that don't get the hands to busy screwing on/off things looking through pockets in the bag etc.

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    Re: Distance measurement

    Torger,

    Quote Originally Posted by torger View Post
    Thanks for the tips. But to be really smooth to use it would double as a lens cap and you would have one for each lens...
    This may be a very silly suggestion, but would an ExpoDisc work?

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    Re: Distance measurement

    Quote Originally Posted by torger View Post
    Thanks for the tips. But to be really smooth to use it would double as a lens cap and you would have one for each lens. Just like I have a cable release permanently attached to each lens to speed up workflow.

    Another alternative is to add step rings to all lenses so all get the same diameter so one could have a single lens cap that fits them all.

    Out in the field one wants to have small practical things that don't get the hands to busy screwing on/off things looking through pockets in the bag etc.
    as to the Sinar white shading diffusor there are adapter rings for all LF lenses and of course also lens caps that fit on the adapter rings... so you don't have to buy a white diffusor for each lens: Sinar Photography » Accessories Lenses

    I do use this system together with the arTech lens shade and like it very much...
    Likes 1 Member(s) liked this post

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    Re: Distance measurement

    Quote Originally Posted by AreBee View Post
    Torger,

    This may be a very silly suggestion, but would an ExpoDisc work?
    Unfortunately not. It has a vignette all of it's own.

    Ditto the LEE circular white lens cap doesn't work (I leave my LEE rings on each lens and use these as the lens caps). It has a circular ring in the centre that makes it unusable for LCC.

    Both work well for white balance though
    Remember: adventure before dementia!

    As Oscar Wilde said, "my tastes are simple, I only like the best"

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    Re: Distance measurement

    Quote Originally Posted by GrahamWelland View Post
    Unfortunately not. It has a vignette all of it's own.

    Ditto the LEE circular white lens cap doesn't work (I leave my LEE rings on each lens and use these as the lens caps). It has a circular ring in the centre that makes it unusable for LCC.

    Both work well for white balance though
    I have used the Expodisc exclusively for making LCC files and have never been bothered by its questionable vignette. Vignetting is completely adjustable in C1 so if that issue exists it wouldn't be something that would stop me from using the Expodisc.

    Victor

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    Re: Distance measurement

    Quote Originally Posted by GrahamWelland View Post
    Both work well for white balance though

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    Re: Distance measurement

    Quote Originally Posted by vjbelle View Post
    I have used the Expodisc exclusively for making LCC files and have never been bothered by its questionable vignette. Vignetting is completely adjustable in C1 so if that issue exists it wouldn't be something that would stop me from using the Expodisc.

    Victor
    If it works for you then

    My point is that the expodisc vignette may be way different to the actual lens vignette and so may over or under correct or also be of a different size.
    Remember: adventure before dementia!

    As Oscar Wilde said, "my tastes are simple, I only like the best"

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    Front nodal point of Rodie 40?

    My Disto D510 arrives tomorrow. For the true connoisseur, a question:

    If I want to focus very very accurately, I need to know the exact distance between the front nodal point of the lens and the subject. So does anyone know where the front nodal point is on the Rodie 40, so I can align the Disto to it? It is quite a long lens, so this could affect distance setting by several cm, which could be significant under some shooting conditions...

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    Re: Distance measurement

    To find the nodal point, put your camera on a rail and rotate it. Look at a ground glass and the images of two vertical elements at different distances should not move closer together or further apart if you are rotating the camera at the nodal point.

    I always though the distance scale on a lens was calibrated to the image plane and not the nodal point (AKA the entrance pupil).

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    Re: Distance measurement

    Tim, you could alway focus to a known distance (or position the camera at a known distance) and then move the Disto until it reads that distance. That should be easier.

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    Re: Distance measurement

    Graham:

    One thing I have started is to use the Lee wide angle hood with most of my wides. Mine has the 1 filter slot. You can cut a 4 x 4 of white plastic or use the card that Capture Intgration sells. The card from CI is a bit narrow but works. It fits in the filter slot. No vignetting as long as you use the lee wide angle adapter rings.

    You can also use the large phase one LCC card from the front of the hood. I use two spring clips to hold it on.

    Both solutions works great for LCC captures.

    Paul Caldwell

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    Re: Distance measurement

    Paul

    I use that too. For LCC I unhook the shade and use my capture integration LCC card flush to the lee ring. It sounds like a good option to have a precut 100mm card that you just place in the hood without having to remove the hood.
    Remember: adventure before dementia!

    As Oscar Wilde said, "my tastes are simple, I only like the best"

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    Re: Front nodal point of Rodie 40?

    Tim,

    Quote Originally Posted by tashley View Post
    If I want to focus very very accurately, I need to know the exact distance between the front nodal point of the lens and the subject.
    The terms "nodal point" and "entrance pupil" are commonly used interchangably but they are not the same. Shashin has referred to the entrance pupil and, if you are not already aware of it, this is quite a good guide on ways in which to determine its position (the term "no parallax position" is synonymous with entrance pupil).

    If you really are interested in the nodal point then the foregoing is of no use to you.

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    Re: Front nodal point of Rodie 40?

    Quote Originally Posted by AreBee View Post
    Tim,



    The terms "nodal point" and "entrance pupil" are commonly used interchangably but they are not the same. Shashin has referred to the entrance pupil and, if you are not already aware of it, this is quite a good guide on ways in which to determine its position (the term "no parallax position" is synonymous with entrance pupil).

    If you really are interested in the nodal point then the foregoing is of no use to you.
    Thanks - I think that I am interested in the front nodal point - but what I am really interested in, in an underlying sense, is exactly where to measure from, when the subject is what I am measuring to. Conventional DOF tables are based on a 'thin lens' assumption but the issue is, I think, at exactly which point in the lens does the image become inverted. I think.

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