Photons Missing In Action

Started Nov 24, 2009 | Discussions thread
ElanR New Member • Posts: 22
Re: Part 1: Lens T-stops

Another thanks for this unique post and all the effort that went into it.

That a lens' light transmission is somewhat different from its aperture rating should not come as a surprise, as that rating is merely a physical ratio that we expect to deliver a certain amount of light, not an actual measure of that light. It also should not be surprising that the tele-zoom lenses with the largest number of elements deliver significantly less light than similarly rated shorter primes, as the extra distance and all the glass the light has to pass through do take their toll. With that said, I am surprised at some of your findings.

More information about the testing equipment used and your methodically would be much appreciated. I'm looking forward to your color-cast test.

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