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Thread: GF1-IR, take 2

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    Sr. Administrator Jack's Avatar
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    Thumbs up GF1-IR, take 2

    Just got the GF1 back from Precision (LINK) for the re-work. For the history on this GF1 conversion journey, here is the original post: http://forum.getdpi.com/forum/showthread.php?t=13269

    So, how did the rework turn out? In a word, I am STOKED!!!

    Here is the summary of what was corrected. As it turns out, the dust shaker in the GF1 has added IR block and needed to be removed. Also, it turns out the 665 nm conversion in this camera allows just enough visible light to prevent infinity focus with short focals, like under 16mm. However, if you step up to the 715 nm conversion, then enough additional visible light is trimmed out so all the lenses hit infinity, even the little 7-14 zoom at 7mm! Moreover, at least for my preferences, the 715 conversion generates the perfect balance in a conversion having just enough visible light to generate interesting false-color effects, while maintaing enough pure IR to easily achieve the the typical dramatic, high-contrast B&W result. Finally, this conversion easily allows for creating in-camera WB's that work very well. Oh, and I should mention the camera shows zero signs of being worked on at all, and looks just as new as it did when I sent it to them.

    Note also that I have not seen any significant "hot-spotting" with this conversion using the 14-45 kit lens or the 7-14 wide zoom -- another pleasant result!

    Here are some example images. First is the "out of camera" as-shot image, using the in-camera created WB and no enhanced adjustments in C1, my preferred raw converter:



    Next is the same image, just opened it in Photoshop and adjusted contrast and saturation for a more dramatic out-of-the-camera image:



    Here is the same originally processed image with the Red and Blue channels swapped in Photoshop and adjusted for for final contrast:



    Next is a quick B&W conversion, also done in Photoshop:



    Since that image had limited blue sky, here is a second image with blue sky and green foliage for reference on how it handles those colors. The out of camera colors look similar to the above, just more "color":



    Here is the R<>B channel swap false-color:



    Late edit, here is the same as above with the sky "normalized" per comments added under the basic swap false-color for easier comparison --- personally I still prefer the straight swap false-color as it seems closer to what I recall IR Ektachrome rendering:



    And here is a B&W conversion:



    Keep in mind that the above are my first images and I am still learning how to extract the most from them in processing, but I think they certainly show a lot of promise.

    In summary, I am really happy with this conversion and the results I am now getting from this revised 715 nm conversion are exactly what I wanted and hoped for, so a big "Thank You!" to Precision Camera!

    For more details on Precision Camera's conversions, please visit their website: http://www.precisioncamera.com/infra...-services.html. IR conversion inquiries should go to their email address at [email protected]. This generates a specific form for the IR customers to distinguish them from the many other cameras that come in through the doors every day for other repairs.

    Price for conversions is subject to change, but here is the current pricing structure:

    Point & Shoot Camera - $179+$6.95 (S&H)
    Compact Hybrid Camera - $249+$6.95(S&H)
    DSLR Camera - $299+$6.95 (S&H)
    Full-Frame DSLR Camera - $349+$6.95 (S&H)

    The GF1 falls under the "compact hybrid" category.
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

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    Senior Member kdphotography's Avatar
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    Re: GF1-IR, take 2

    Awesome great news, Jack!

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    Super Moderator Cindy Flood's Avatar
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    Re: GF1-IR, take 2

    +1 The black and white conversions look really good.

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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Thanks guys, I am really happy with the way this turned out. I should add that I'm getting fairly "normal" exposures as well. The light in the second second image above was darker than typical daylight by 2 - 3 stops, and the exposure was 1/400th @ f6.3 at ISO 400, or very close to a regular visible light exposure.
    Jack
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    Re: GF1-IR, take 2

    Jack,
    Are you converting to B&W with the original or after you've swapped the red & blue channels?

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    Administrator, Instructor Guy Mancuso's Avatar
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    Re: GF1-IR, take 2

    Damn I like this a lot . May have to do it to mine or get a second body
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: GF1-IR, take 2

    Thanks for the information, Jack.

    The samples look good.

    Without the dust shaker (a little more focus adjustment must have been possible by about ~0.5mm), how are you going keep the cam dust free?

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    Re: GF1-IR, take 2

    Jack,

    I have been taking IR photos with a converted G9 going on 4 years. Your IR photos look great. After I upgrade to future m4/3 camera, my G1 will go to the conversion shop and get a 715 filter. Thanks for sharing and working out the problems.

    Howard

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    Contributing Editor ustein's Avatar
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    Re: GF1-IR, take 2

    Jack, looks very good. Alviso?
    Uwe Steinmueller
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    Editor&Owner of Digital Outback Photo
    http://www.outbackphoto.com

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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Quote Originally Posted by TEBnewyork View Post
    Jack,
    Are you converting to B&W with the original or after you've swapped the red & blue channels?
    Hi Terry:

    I experimented with both, and the bottom line is in Photoshop it really didn't matter -- if I left the image normal, I used the default blue filter, if I swapped, I used yellow filter and the results were virtually identical. However both of the above shots I did after the R<>B swap. With more time, I will develop a standard process, maybe even beginning in C1...
    Jack
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    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Quote Originally Posted by ustein View Post
    Jack, looks very good. Alviso?
    Hi Uwe,

    Thank you and yes, it was Alviso
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

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    Re: GF1-IR, take 2

    Great improvement after the 715 nm conversion.
    I still like the B+W versions more than the false colors.

    Thanks for sharing.

    Seyhun
    H3DII-31, 5DII, M8, NEX-3 and Camera collection
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    Senior Member DHart's Avatar
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    Re: GF1-IR, take 2

    Jack.... WOW! This is so timely for me because earlier this evening I had been thinking about what to do with my unused G9 and Canon 30D. Figured I'd sell them and use the proceeds toward a 7mm-14mm lens for my GF1. But the thought of converting one of them to a dedicated IR camera occurred to me also and I decided I would do that with one of them.

    THEN, I come across this inspiring thread of yours and I'm really stoked about IR now. But in a quandary as well. SHould I od an IR conversion to the 30D, the G9, or sell them both and use the funds to acquire and convert a second GF1 body? Dang.

    Any thoughts anyone on which of these options you would choose?

    I can sell the 30D, battery grip, batteries, and zoom lens as separate pieces and net perhaps $600. Sell the G9 with wide angle lens adaptor, lens/accessory hood, and extra batteries for, perhaps, $300? And with that $900 buy a second GF1 body and convert it to IR.

    Or keep the 30D or the G9 and convert one of them to IR? (I also have a 5D, a 5DII and bunch of L-glass for my professional work, so losing or converting the 30D and it's lens is no loss to me either way.)

    The GF1 is my dedicated travel/off-work camera (along with a ZS3) so if I had a second GF1 IR, that would travel along nicely with my other GF1 gear. If I convert the 30D or the G9, taking one of them along with the GF1 gear on a trip would be less system-ideal, though the functions of the 30D and my lens options for it are superior to the GF1 and the G9.

    I'm leaning toward the second GF1 as an IR option, but what would you do?
    Last edited by DHart; 30th January 2010 at 01:08.

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    Senior Member DHart's Avatar
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    Re: GF1-IR, take 2

    Unable to re-edit my last post, so I'll ask here... another possibility would be to acquire an LX3 and have it converted. I've been very impressed with the images I've seen from the LX3 and it's limited focal length doesn't concern me for IR use as I would be mostly interested in the wide angle end of things and an 18mm lens is available for the LX3.

    As there are likely some aspects of this consideration that I am not thinking of or aware of, hearing other's thoughts and suggestions would be wonderful. Thanks in advance.

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    Re: GF1-IR, take 2

    That's exciting. Down the road I'll plan to have one of my bodies (likely GF1) converted to IR. Sure will be nicer than lugging my converted old 10D LOL.

    I like the conversions also--very nice and we'll look forward to seeing what you end up with for workflow.

    Diane

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    Senior Member DHart's Avatar
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    Re: GF1-IR, take 2

    Jack's wonderful results above and

    Quote Originally Posted by Diane B View Post
    Sure will be nicer than lugging my converted old 10D LOL.
    encourages me to sell my 30D rather than convert it.

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    Super Duper
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    Re: GF1-IR, take 2

    Looking very good with the new modified GF1 Jack. Neutrals and blues (skies in particular) tend to be a little cyan or green after the channel switch, but a slight tweak with a hue/sat layer adjustment can give you cleaner neutrals and pure blues.
    Carl
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    Member kwalsh's Avatar
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    Re: GF1-IR, take 2

    Quote Originally Posted by DHart View Post
    Unable to re-edit my last post, so I'll ask here... another possibility would be to acquire an LX3 and have it converted.
    LX3 is a bad choice, its lens hot spots in IR. Which is too bad, it would make a wonderful compact IR solution otherwise!

    Ken

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    Re: GF1-IR, take 2

    Dhart,

    I converted my G9 to ir when the G9 was first introduced. I read that you are considering the G9. If you review my photo website (shown below my name) beginning with the third gallery nearly all ir are taken with my converted G9 so you can determine whether the results meet your standards. I have been pleased with the ir results of the G9 when shooting at base ISO (80 or 100--I shot ir at night with a tripod also with good results) -- the zoom lens range is long; the AF works well except in close up Macro and the exposure is generally very good. My gallery location appears below my name. As far as the LX3, Ken indicated above and I recollect reading in one of the various forums, the LX3 lens experiences hot spots when shooting ir.

    Good luck with your decision.

    Howard
    http://photo.net/photos/howardfuhrman

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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Thanks guys. I'll answer en-masse...

    Color v B&W: The nice thing about the 715 is you can get B&W that is almost identical to the stronger conversions, but can still get false-color if you want it. Given the camera is live view and not SLR, I can also just mount a stronger IR filter for the more dramatic monochrome effect. The other thing to consider is working shutter speeds as the stronger conversion usually slow the camera down an additional 3 stops or so. However, if you KNOW for sure you never want to do false color and want the strongest IR effect possible, then by all means get one of the monochrome conversions.

    Converting, GF1 versus older cameras you already own: IMO the one *HUGE* beneit to converting a second GF1 body, is even if you upgrade your regular M4/3rds cameras, you'll have an IR solution that uses the same glass. IMO this is a significant advantage since you don't have to carry around a complete extra system. Ditto batteries if you stay inside the family like G1, GH1, GF1... FInally, it appears the Panny lenses do not hot-spot significantly, at least the kit zoom and the 7-14, and at least with the 715 conversion. You may not be so lucky with another conversion. Finally, experience tells me -- at least for me -- that an IR camera needs to be relatively small to insure it gets carried 100% of the time, and the GF1 with kit lens fits inside a single lens pocket in my MF bag...

    My existing conversion color rendition: I agree the sky is a bit cyan, but that is pretty darn close to what I remember Ektachrome IR doing. Of course with some simple tweaking, it will be pretty easy to get a bluer sky. I'll probably create a Photoshop action that sharpens the file for IR, does my channel swap and tosses up layers to tweak H, S, Contrast and adds a B&W overlay.

    Oh, and a note on the file and raw processing -- before anybody does this conversion, they should know the camera is a little noisy. The above shots were taken at ISO 400, and I bumped NR settings in C1 up a bit from normal to 25 Lum, 50 Color. So because of that, I also bumped up sharpening by using C1's Soft-Sharpen 1 setting. I am pleased with the overall result, but will likely refine it as I gain experience with the camera.
    Jack
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    Re: GF1-IR, take 2

    Jack, How is the dust management without the dust shaker in place?

    Could you show a picture of your converted cam (without any lens or body cap on)?

    TIA.

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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Quote Originally Posted by Vivek View Post
    Jack, How is the dust management without the dust shaker in place?

    Could you show a picture of your converted cam (without any lens or body cap on)?

    TIA.
    I'll snap one later. Dust management is now old school -- blower and/or fluid and swabs as needed, but the access is bone simple since the sensor (covered by the IR filter) is right there and the camera has a short and wide throat. Note that Precision did indicate they keep all the parts and can restore this camera to full normal operation if desired. Of course for the cost, it would be cheaper to sell the IR convert and purchase a new visible replacement, but the point is the camera's basic integrity is not compromised.
    Jack
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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Here's a corrected sky version, just did a quick selective hue edit in CS -- speaking for myself only, I prefer the original more cyan version:

    Jack
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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Note: I just updated the original post to include current pricing as well as a direct email to use for IR conversion inquiries.
    Jack
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    Re: GF1-IR, take 2

    Jack,

    did they do any E-P1 conversions before?

    Uwe
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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Quote Originally Posted by ustein View Post
    Jack,

    did they do any E-P1 conversions before?

    Uwe
    I don't have any idea, sorry. Best to contact them directly at the email address above and ask -- they are very responsive to inquiries and very easy to deal with.
    Jack
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    Senior Member DHart's Avatar
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    Re: GF1-IR, take 2

    kwalsh, Howard, Jack... thank you all very much for the info. Too bad about the LX3's hot spots.

    Howard... you've got some wonderful looks with your G9. Which conversion did you have done? Are your false color images mostly done with no filtration over the lens and your monochrome IR images all done with just one filter over the lens?

    I was originally thinking about a monochrome conversion as I hadn't seen that many false color images that I really liked... until I found work by Michael "camboman"

    http://www.pbase.com/camboman/zionir

    I believe these were done with a 665 IR conversion on a D80. The false color look he has achieved in this gallery, especially, really appeals to me. It seems likely that he does a lot of color work to these images after capture to get the rich intensity that he achieves... especially with his ziorir images. Typically the color richness isn't like this straight out of the camera, is it?

    I guess the 665 on the GF1, however, may not be a good way to go. I'm wondering, Jack, if the 715 can get a similar look from the GF1 to what Micheal gets with the 665 in the D80. Any ideas on that?

    Lastly, is it asking too much of a single IR conversion to be able to get great false color IR AND great monochrome IR?

    Jack... I brought one of your street images above, as an example, into Lightroom to see what could be done with post color work and WOW, I can see that there's so very much that can be done in coloration variations. Really nice. I'm really looking forward to seeing more of what you can do with your GF1! Many thanks for your sharing.
    Last edited by DHart; 30th January 2010 at 12:22.

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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    You can indeed do a lot with false color in post. However, the more distinct color you have to begin with, the more you can do, and for sure the 665 conversion allows a lot more green through (actually it allows enough more blue through to render green), so in the end it all depends on what results YOU want to achieve. I am personally not a big fan of the highly saturated look in the gallery you linked to -- in fact they look more than IR conversions as the artist has several images where the same type of tree has a totally different leaf or needle colors, which just doesn't look right to me. I am more likely to do B&W's with the occasional false-color, which is why I settled on the 715. For you, the 665 may be the better choice, but if you want results like the gallery you linked to, I suspect that could be achieved with the 715 combined with aggressive post-process selective coloring. Note that if you do choose the 665, Precision can modify the lenses to achieve infinity focus with the 665 conversions.
    Jack
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    Senior Member DHart's Avatar
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    Re: GF1-IR, take 2

    Thanks Jack... I appreciate the input! I got a very quick and detailed reply from Mark @ Precision... wow, they really are customer responsive! And they're pricing is well below some of the competition.

    Mark personally uses the G9 himself for IR and speaks very highly of it. He said that they do more conversions on the G9 than anything else and there are no hot spots with the G9 whatsoever. Since I have a lonely, unused G9 in the closet... it can find some great utility.

    With the incredible conversion to B&W options available in post these days (color enhancements as well), I may go with the 665 in my G9. Perhaps down the road add another GF1 and go with the 715 in that body.

    Interestingly, Mark spoke glowingly of the LX3 as a conversion candidate and made no mention of hot spots with it. I think I'll ask him more about hotspots the LX3.

    This is so much fun!

    Oh... one more question.. to achieve the monochromatic B&W IR look with the 715 (or the 665 for that matter) is it necessary to add filtration to the lens or can that be done about as well in post?
    Last edited by DHart; 30th January 2010 at 12:55.

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    Senior Member DHart's Avatar
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    Re: GF1-IR, take 2

    Jack... have to say that I really love the tracks image... wonderful. And the B&W conversion is my favorite of the variations. I can see you're going to have a great time with that GF1/715IR. I'm envious!

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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    Thank you, it was a quick grab, but I like it too, other than the pair of seagulls sitting on teh tracks My B&W conversions were all done in Photoshop, using their standard B&W adjustment, no filters on the camera. My point was i you want/need even stronger IR, I can always add a stronger IR filter over the lens.
    Jack
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    Contributing Editor ustein's Avatar
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    Re: GF1-IR, take 2

    I got quite a few modified IR cameras and this one looks better then all of them.

    715nm is the way to go and these cameras are so small that there is no excuse not to have a IR camera with you all the time.
    Uwe Steinmueller
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    Editor&Owner of Digital Outback Photo
    http://www.outbackphoto.com

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    Re: GF1-IR, take 2

    Dhart,

    In answer to your several inquiries. I had my G9 converted with a R72 equivalent filter. I do not use any filters to achieve false colors, it is all done in PP. As Jack indicated, some ir photos out of the camera lend themselves to color and others to B&W. It took me a long while to achieve blue sky and in many cases it never looks right. I am hesitant to post any photograph that is not taken with a m4/3 camera in this forum. but you can review my website and see several hundred of my ir photos. Based on ir photos posted by others, it seems as if better ir color is achievable with the 665 or similar filter.

    Howard
    http://photo.net/photos/howardfuhrman

  34. #34
    Senior Member DHart's Avatar
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    Re: GF1-IR, take 2

    Thanks, Howard. You've got some great images in your galleries... thank you for the reference to them. I really like your Washington, DC images. Obviously, the G9 makes a wonderful IR machine.

    I do equally like the wide-hue, vividly colored IR stuff like this:

    http://www.pbase.com/camboman/zionir

    as well as the punchy, contrasty B&W stuff that we all know and love so much. And it seems that to do that with one camera, depending on the camera, the 665 will make that possible. I can always put a 720+ IR filter on the lens to really pop the contrast for B&W and/or do so in post. At this point I think I'm going to send my G9 off to Mark @ Precision for the 665 conversion. And then when the GF1 body pricing/availability loosens up a bit, pick up another GF1 body and do just as Jack did with his... convert to a 715.

    Jack, finding your thread on the GF1 IR conversion has really opened my eyes and mind to a lot today and I've learned so much from this crash course. (I've hardly left my Mac and researching on the internet for the last 18 hours!) Thanks for sharing your conversion saga and I really look forward to seeing what you do with your GF1 IR as time moves forward.

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    Sr. Administrator Jack's Avatar
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    Re: GF1-IR, take 2

    DHart, glad you've found it so useful -- that's the whole point of the forum!
    Jack
    home: www.getdpi.com

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  36. #36
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    Re: GF1-IR, take 2

    Quote Originally Posted by ustein View Post
    I got quite a few modified IR cameras and this one looks better then all of them.

    715nm is the way to go and these cameras are so small that there is no excuse not to have a IR camera with you all the time.
    Having owned a few IR cameras myself, I'd have to agree. The biggest issue for me was the "having it with you all the time" problem --- most of my previous conversions were either too large, too inconvenient to use or built on a completely different system than the one I was using. Because of that they never got actually carried unless I thought I wanted to do only IR, which never happened very often. So mostly those cameras stayed in the trunk of the car and never got into my active shooting bag. This particular camera with the kit lens mounted fits in a single lens slot, so I won't have too many excuses for not having it with me at all times.
    Jack
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    Re: GF1-IR, take 2

    That's exactly my case. I had the 10D converted a good while ago--but it was one more camera body to carry--didn't offer a backup in actuality, just a 'third'--and now in the last year when I've mostly carried the m4/3rds, a different system. Whether I shoot with the Canon system or m4/3rds, having a GF1 converted to IR makes sense--small enough to not matter that much as second camera system or included with the other m4/3rds even more lenses to use.

    Thanks for sharing the bad--and then the good--about this conversion Jack. I bet it ends up with more conversions for Precision--and good for them that they were outstanding for customer service.

    Diane

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    Re: GF1-IR, take 2

    Having some fun with a few of the files from the IR maiden voyage.

    Here a straight B&W conversion from the in-camera IR, plus some slight curve. I am amazed by the amount of DR you are able to keep in the file during capture:



    This one was into the sun, so it ended up very soft. I bumped saturation and contrast quite a bit in post and of course did the R<>B channel swap. This Acacia tree was full of the little yellow flower balls:



    This one was heavily tweaked -- channel swap then a bleach-bypass color conversion routine I do in CS which heavily increases contrast, lowers saturation in the high tones and increases it in the low tones, leaving just a hint of colors:

    Jack
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    Administrator, Instructor Guy Mancuso's Avatar
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    Re: GF1-IR, take 2

    That is what I am looking for Jack this very last shot, is a look like that.
    Photography is all about experimentation and without it you will never learn art.

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    Re: GF1-IR, take 2

    Thanks Guy -- I like the added drama as well.

    Still have a lot to learn about processing these out, but for reference, here is the marsh shot done with the bleach-bypass routine:



    And while it clearly won't work for every shot, it can definitely alter the overall mood of the shot -- here is the Acacia tree done in the bleach-bypass:



    Dang, I think I'm going to have to write an action for IR bleach-bypass!
    Jack
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    Re: GF1-IR, take 2

    Jack,

    I appreciate that you documented the issues that you experienced with your initial conversion and what was done to correct the situation.

    I also agree with you and Diane, the ir camera that is sitting in your closet does no good when there is an ir shooting opportunity.

    Howard

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    Re: GF1-IR, take 2

    Jack that one image I would like to do some vignetting and than add some grain. I think our Salton Sea workshop everyone could come away with some really cool looks . Reason I want to get one before we leave so the folks can play with it also. Having at least two IR camera's in hand would be great. I'm going to sell the 14-140 so I can get a GF1. I decided . I'm really after one lens anyway the 7-14mm. I'm a wide angle freak
    Photography is all about experimentation and without it you will never learn art.

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    Re: GF1-IR, take 2

    Quote Originally Posted by Guy Mancuso View Post
    Jack that one image I would like to do some vignetting and than add some grain.

    I also find IR very interesting for Blending.

    Uwe Steinmueller
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    Editor&Owner of Digital Outback Photo
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    Re: GF1-IR, take 2

    Uwe I like that also very nice combo going on.

    My thinking is the IR gives you a great opportunity to try something different in your work but also gives you a lot of play time in your raw program and/or PS to learn further skills. As a commercial shooter I personally would love to have the other portfolio to show my personal work which i don't do very often or maybe better said force me to get out and do more personal work. But end of the day I want it to have a different look than my real work. The IR intrigues me to get out there more often for that. I did a lot of IR film in years past and to me it was fun.
    Photography is all about experimentation and without it you will never learn art.

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    Re: GF1-IR, take 2

    The IR shot by itself was very fragile
    Uwe Steinmueller
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    Editor&Owner of Digital Outback Photo
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    Re: GF1-IR, take 2

    Minor update:

    I just confirmed that adding a stronger IR over the lens works just fine if you want that. I used a B+W 093 opaque IR filter which is equivalent to a Wratten 87C. An 87C trims IR at ~~ 850nm, so basically no visible light at all gets through. It works fine and you can still compose normally via the LCD display. Light is cut about 2 stops above what the 715 conversion does, but I still maintained very easily hand-holdable shutter speeds. My 715 WB rendered a blue-ish cast monochromatic image, so I'd set WB2 to this filter if I were going to use it a lot. But then since it is totally monochromatic, it doesn't matter what you point it at to set get neutral tones and is easy to set whenever.
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    Re: GF1-IR, take 2

    FYI I just bought a GF1 and it is being converted to IR and will have it on the workshop for folks to try out as well. Yes the Gear slut strikes again. LOL
    Photography is all about experimentation and without it you will never learn art.

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    Re: GF1-IR, take 2

    Quote Originally Posted by Jack Flesher View Post
    Minor update:

    I just confirmed that adding a stronger IR over the lens works just fine if you want that. I used a B+W 093 opaque IR filter which is equivalent to a Wratten 87C. An 87C trims IR at ~~ 850nm, so basically no visible light at all gets through. It works fine and you can still compose normally via the LCD display. Light is cut about 2 stops above what the 715 conversion does, but I still maintained very easily hand-holdable shutter speeds. My 715 WB rendered a blue-ish cast monochromatic image, so I'd set WB2 to this filter if I were going to use it a lot. But then since it is totally monochromatic, it doesn't matter what you point it at to set get neutral tones and is easy to set whenever.
    Jack,
    Interesting information and good to know that the GF1 sensor seems to be exhibiting high iR sensitivity, even with the higher wavelength cut filters. The blue monochrome was exactly my experience with the 87C years ago when I first started working with IR using the old Nikon 950. Some discussion here about the 87C blue monochromatic images.
    Carl
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    Re: GF1-IR, take 2

    Interesting -- mine were nowhere near that blue, more like cool or selenium-toned. I'll test it out more thoroughly tomorrow and post some images.
    Jack
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    Re: GF1-IR, take 2

    Jack - I can't tell you how pleased I am that you got the IR conversion figured out. The very first images of the railroad are amazing and the others will good. I've found when shooting IR I have to rethink my basic strategy and think in IR terms. The hotter the day is the sunnier the day is the better the images will be. Deep blue skies and lots of fluffy clouds are just icing on the cake as well.

    Looking forward to seeing many more IR images here.

    Don
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