EXCERPT page containing first few paragraphs. 2020-07-06 02:07:47
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Conversion by MaxMax.com:
- The sensor cover glass was removed and replaced with new glass of appropriate thickness that passes infrared and blocks visible light.
- The modified D800 now “sees” only infrared light starting at around 715nm.
- Any and all lenses can be used since the filtration is internal.
Infrared photography properly begins around 715nm, with the range of 715-760nm affording “false color”: the R/G/B photosites respond differently to infrared light (differential transmission). Starting around 760nm, all of the R/G/B photosites go transparent to infrared, thus the image becomes pure monochrome (the photosites all see the same luminance).
The human eye can actually see dimly out to ~900nm (possibly even farther, albeit very dimly), a fact which can be determined by looking directly into an infrared LED in a dark room.
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Diglloyd Infrared Photography covers cameras and lenses for infrared photography.
The coverage explains all the issues involved in shooting in infrared, which do not change. It is not a review of any particular camera or lens, though many examples are included.
- Guidance on workflow for infrared, including black and white and channel swapping for false-color images.
- How infrared renders, and why certain spectral cutoffs matter: false color vs black and white.
- Image quality issues to be on the lookout for in infrared.
- Numerous lens evaluations in infrared.