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Black & White
Hammer's Interesting Infrareds
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<blockquote data-quote="BF Hammer" data-source="post: 787878" data-attributes="member: 48483"><p>Some fair questions there. Converting a camera involves removing the optical filter in front of the sensor which is supposed to block IR and pass visible, and substituting a new filter that will block most visible light and pass light in near-infrared and lower in frequency. My filter is of the 720nm type, which is a very traditional wavelength for the the IR cutoff. Many photographers opt for a shorter wavelength so more color will appear.</p><p></p><p>With a conversion, the camera basically just sees in a different wavelength and operates mostly the same. I normally just hand-hold and use A-Mode auto-exposure with auto-ISO just like I do with the other cameras. IR light does not refract the same way in lenses so some will work better than others. The autofocus has to be re-tuned and normally works better tuned with a lens you intend to use mainly. The big thing to keep in mind is white-balance. Auto white balance will pretty much make an all-magenta-toned image. I use preset white balance, and use a photo taken in green grass as the reference value for white. The preview on the camera back will show the image mostly correct. Of course the optical viewfinder is still a color composition. This conversion would be more ideal on a mirrorless body.</p><p></p><p>Processing the Raw image, you can tune the WB more by sampling any leafy plants in the image, as they should be white. Sunny skies will have a copper-color to it, and some browns appear. It is individual taste if you process with the IR conversion color pallete or desaturate to B/W. I look at the image and let it tell me which way I process it. I find with the D600 that it works better with extra contrast added and some highlights/shadows adjustments. Not too different than my color processing.</p><p></p><p>This D600 is really my 4th IR converted camera. My first was something I DIY-converted. I used a Coolpix 2200 and cut a piece of exposed/processed color print negative as my filter. It really worked, such as it was. That was done to determine if I would spend real money to professionally convert my Coolpix 995, and I did. Still have that 3.4MP camera, but it is limiting today. I converted a beat-up and well-used D80 professionally, and some months later it decided to die on me. Last year I decided I was not done playing in IR yet, so I shopped for weeks looking for a used camera already converted by somebody else. That is how I wound up with this current D600.</p></blockquote><p></p>
[QUOTE="BF Hammer, post: 787878, member: 48483"] Some fair questions there. Converting a camera involves removing the optical filter in front of the sensor which is supposed to block IR and pass visible, and substituting a new filter that will block most visible light and pass light in near-infrared and lower in frequency. My filter is of the 720nm type, which is a very traditional wavelength for the the IR cutoff. Many photographers opt for a shorter wavelength so more color will appear. With a conversion, the camera basically just sees in a different wavelength and operates mostly the same. I normally just hand-hold and use A-Mode auto-exposure with auto-ISO just like I do with the other cameras. IR light does not refract the same way in lenses so some will work better than others. The autofocus has to be re-tuned and normally works better tuned with a lens you intend to use mainly. The big thing to keep in mind is white-balance. Auto white balance will pretty much make an all-magenta-toned image. I use preset white balance, and use a photo taken in green grass as the reference value for white. The preview on the camera back will show the image mostly correct. Of course the optical viewfinder is still a color composition. This conversion would be more ideal on a mirrorless body. Processing the Raw image, you can tune the WB more by sampling any leafy plants in the image, as they should be white. Sunny skies will have a copper-color to it, and some browns appear. It is individual taste if you process with the IR conversion color pallete or desaturate to B/W. I look at the image and let it tell me which way I process it. I find with the D600 that it works better with extra contrast added and some highlights/shadows adjustments. Not too different than my color processing. This D600 is really my 4th IR converted camera. My first was something I DIY-converted. I used a Coolpix 2200 and cut a piece of exposed/processed color print negative as my filter. It really worked, such as it was. That was done to determine if I would spend real money to professionally convert my Coolpix 995, and I did. Still have that 3.4MP camera, but it is limiting today. I converted a beat-up and well-used D80 professionally, and some months later it decided to die on me. Last year I decided I was not done playing in IR yet, so I shopped for weeks looking for a used camera already converted by somebody else. That is how I wound up with this current D600. [/QUOTE]
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