Photons Missing In Action

Started Nov 24, 2009 | Discussions thread
noirdesir Forum Pro • Posts: 13,586
Re: Photons Missing In Action

Marianne Oelund wrote:

This thread is all about those unfortunate photons which wander into your lens, but fail to reappear at the other end - even though they were on the right path to do so.

Stupid question, where do they end up?

  • some will be reflected back out

  • some will be absorbed by the inner lens tube and baffles

  • some will be absorbed by the glass itself

  • yet some will end up on the sensor as haze, if you shoot a homogeneous target you won't be able to distinguish between those photons which stayed on course and those which took a detour (but I don't think the amount is very large in relative terms). If you measure a small bright target in front of dark background, you can minimize that error.

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