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Thread: dumb question

  1. #1
    Senior Member back alley's Avatar
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    dumb question

    are the settings for hyper focal distance shooting the same if i use a lens on a film body and the g1?

    i went out today in the blazing sunshine, zm 21 on the g1 and set the aperture at f8 and then set the lens distance for hyper focal shooting.
    shots were sharp so it must have worked but i still feel the need to ask.

    joe

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    Re: dumb question

    Joe, The liveview (big screen and not the EVF) actuall would show you what difference it makes if you check the lens wide open to say, f/8. This isn't a range finder camera, you know (just stating the obvious in case you forgot)!

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    Senior Member back alley's Avatar
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    Re: dumb question

    agreed, but it's the closest thing to a drf than i can afford

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    Administrator Bob's Avatar
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    Re: dumb question

    Not such a dumb question.
    A lens actually focuses at only one distance. In front of and behind that point of focus, the image blurs. The amount of acceptable blur for something to appear in-focus is called the circle of confusion. It actually varies depending on film and sensor size, and some say, for critical nose-distance viewing (including me) by the pixel pitch of your sensor.
    For a print-size DOF explanation see http://www.bobatkins.com/photography...l/dofcalc.html
    From my point of view, however, the DOF scales seem always to be too generous since I am a dyed-in-the-wool pixel peeper LOL
    -bob

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    Re: dumb question

    Quote Originally Posted by Bob View Post
    Not such a dumb question.
    A lens actually focuses at only one distance. In front of and behind that point of focus, the image blurs. The amount of acceptable blur for something to appear in-focus is called the circle of confusion. It actually varies depending on film and sensor size, and some say, for critical nose-distance viewing (including me) by the pixel pitch of your sensor.
    For a print-size DOF explanation see http://www.bobatkins.com/photography...l/dofcalc.html
    From my point of view, however, the DOF scales seem always to be too generous since I am a dyed-in-the-wool pixel peeper LOL
    -bob
    Bob, following on to the sensor size part for the M8 wasn't the best advice to use a stop or two less on the scale? For instance if you were shooting at f8 use the hyperfocal setting for f5.6.

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    Senior Member petermcwerner's Avatar
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    Re: dumb question

    Quote Originally Posted by TEBnewyork View Post
    Bob, following on to the sensor size part for the M8 wasn't the best advice to use a stop or two less on the scale? For instance if you were shooting at f8 use the hyperfocal setting for f5.6.
    So shouldn't it be more stops for the G1 since the sensor is smaller than on the M8? Is anyone bold enough to make some tests to see whether the theory is correct in real life?
    Peter Werner
    Leica M8, R9+DMR & Digilux 2; Nikon D700; Panasonic FX01, FX150 & G1; Samsung TL350 (WB 2000)

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    Senior Member Per Ofverbeck's Avatar
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    Re: dumb question

    A major problem is that one can´t trust the distance scales when using adapters. My Novoflex (for Leica M lenses on G1) is a bit too thin, so when focussing any of my lenss visually on a distant object, the scale says something else (depends on the FL of the lens, since it is a fixed flange distance error); on my Summicron 50 it is between 5 and 10 meters. And, yes, all the lenses focus correctly on my M2.

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    Senior Member ecliffordsmith's Avatar
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    Re: dumb question

    Hi All,

    As Terry stated, use the hyperfocal distance one stop above your actual aperture.

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    Administrator Bob's Avatar
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    Re: dumb question

    According to my calculations, a 4/3 camera when stopped down to f/16 should yeild the same dof as a 35mm camera at f/8.
    So roughly speaking, you can use the lens scales with a two stop offset.
    -bob

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    Senior Member ecliffordsmith's Avatar
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    Re: dumb question

    Bob,

    Good point! I was in M8 land when I was reading this thread!

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    Re: dumb question

    Quote Originally Posted by Bob View Post
    According to my calculations, a 4/3 camera when stopped down to f/16 should yeild the same dof as a 35mm camera at f/8.
    So roughly speaking, you can use the lens scales with a two stop offset.
    -bob
    Bob, isn't it reversed that the 4/3 at f8 = 35mm at f16?

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    Re: dumb question

    Distance scales, hyperfocal.. come on folks, this isn't a range finder and it isn't a TLR or an SLR with mirror lock-up.

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    Senior Member back alley's Avatar
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    Re: dumb question

    Quote Originally Posted by Vivek View Post
    Distance scales, hyperfocal.. come on folks, this isn't a range finder and it isn't a TLR or an SLR with mirror lock-up.
    what does that matter?

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    Re: dumb question

    Quote Originally Posted by Vivek View Post
    Distance scales, hyperfocal.. come on folks, this isn't a range finder and it isn't a TLR or an SLR with mirror lock-up.
    Ahh..,but it brings back fond memories of my old Rolleiflex when I'm shooting the G1 at waist level. Now if only we could have a Gx with a square sensor

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    Re: dumb question

    Carl, I still have a Topcoflex (the bigger bro of Primo Jr, I have one of those beauties as well)!

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    Re: dumb question

    Quote Originally Posted by TEBnewyork View Post
    Bob, isn't it reversed that the 4/3 at f8 = 35mm at f16?
    I think so too, Terry.

    The COC for 4/3 is half the size of 35mm, so called full frame. So that alone will double your DOF zone.

    DOF is for me, after 30 years of dealing with it, still a confusing item

    Here's another interesting and helpful link:

    http://www.dofmaster.com/dofjs.html

    Cheers, Peter

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    Senior Member Robert Campbell's Avatar
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    Re: dumb question

    There's a useful dof calculator here:

    http://www.cambridgeincolour.com/tut...calculator.htm
    Sláinte

    Robert.

  18. #18
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    Re: dumb question

    I was thinking about this, too . That hyperfocal dist settings would be very useful for pre-focusing. (Still have no lens adapters yet, and still thinking MF in most low light situations handheld is going to be a major PITA w/this camera...)

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    Senior Member Y.B.Hudson III's Avatar
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    Re: dumb question

    sheeze... when focusing wif t' G1 & NoctiLux, I have to put on my sungLasses in lowlight [email protected] 2.8's acceptable, 2.0's gooD, 1.4's exceLLent...the diopter correction is eXcellent for the aging demographic...a diopter correction and magnifier for a Leica M costs aLmost as much as the G1 and is a dim set-up...

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