IR conversions - a question.

Started Aug 11, 2009 | Discussions thread
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David Rosser
David Rosser Veteran Member • Posts: 3,393
IR conversions - a question.

I'm looking at having my D40 converted to IR. The process that is carried out seems to be to remove the existing IR absorbing filter in front of the sensor and replace it with the opposite a IR transmitting visible light absorbing filter. The firm offering conversions in the UK also re-calibrates the autofocus for IR. It appears that the Bayer filters are left in place so that in only the red sensors are actually receiving any IR radiation, the blue and green filters on those sensors will absorb IR and so those sensors will receive no photons. This is confirmed, I think, by the fact that RAW outputs I have seen are red before conversion to black & white. Does this mean that the converted camera has a quarter the resolution of the base camera (the Bayer array has 2 green for every red or blue pixel)? If I have my D40 converted does my 6 meg conventional camera become a 1.5 meg IR camera?
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Dave
http://www.rosser.pwp.blueyonder.co.uk
http://www.pbase.com/dgrosser

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