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12-19-2013, 04:46 AM   #1
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Firmaware of a Pentax camera (sprctral ranges)

I would like to ask you if someone has worked with the firmware of a Pentax camera. I need to know if a modification of the firmware of the camera could be done so that after the removal of the infrarot-filter the channels of the camera: R-G-B and NIR could be defined by themselves. Does anybody know if the channels change automatically to the spectral ranges after the removal of the infrared-filter of the camera? Thank you for the answers and suggestions in advance.

12-19-2013, 05:21 AM   #2
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I have no clue what you said, but I think there are no Pentax firmware hackers out there. There used to be a website that tried to deal with the firmware but nothing was released. You can probably find it by googling Pentax firmware hack or something..
I am mostly posting so I subscribe to this thread, sounds very interesting.
12-19-2013, 05:58 AM   #3
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Why not just get an use a good infrared filter then use your camera's Jpeg control settings to change the color channel output. You could use you own color channel control with using the "custom image" settings and/or use the "Digital Filter" settings to create varied effect. I suggest looking in the menu at "Muted" in "Custom Image" and "Extract Color" and "Color settings" in Digital Filter. Any one of these or combination used with an infrared filter could give you a wide variety of output without going through needing to modify the camera.
12-19-2013, 07:48 AM   #4
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I believe this question has been answered on DPReview. Asking again if you don't like the answer isn't going to help.

12-19-2013, 09:41 AM   #5
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The bayer sensor in the camera has three different types of pixels, red, blue, and green. Simply removing the IR filter doesn't change that, i.e. it doesn't magically create a fourth NIR channel. After removal of the filter however, the red pixels in particular end up capturing more light. There might, theoretically, be a way to redefine the wavelengths the camera associates with "red" and "blue" and "green", but there will only ever be three channels.

Depending on how bad you want it, Kodak, now Platinum Equity I believe, makes a 4 channel sensor that captures RGB+White, called a TrueSense or something along those lines. There is also a company in Wisconsin that makes custom cameras for industrial applications using, among others, these Kodak Truesense sensors. If you have a couple grand burning a hole in your pocket, it might be worth contacting them to see if they can make you a 4-channel NIR camera.

Alternatively, depending on what you are trying to achieve, you might consider IR film.
Rollei Infrared 400 iso 35mm x 36 exp. 2-pack | Freestyle Photographic Supplies
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