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grbrown
professor emeritus
Reged: 07/09/05
Posts: 643
Loc: Ampthill, UK, 52:02N 0:30W
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Re: Brightness in Exit Pupil
06/16/07 06:09 AM
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EdZ,
That is a brilliant piece - many thanks.
In the table in my PANORAMIC BINOCULARS, Part 2! topic I have included, where available, the transmitted percentage of light. Steiner claim a remarkable 96% for their XP models, Fujinon 95% for their FMT-SX. It seems these makers have cracked vignetting!
Presumably it is possible to measure light in/light out, which would make an interesting lunch-time laboratory excercise for one of our optical experts?!
--------------------
Graham
"one eye good, two eyes better...the more I look, the more I see"
BT100-45 degrees, plus 35,24,17,13,9mm Sieberts
15x80, 7x50 Steiners
12x50, 10x42, 8x20 Leica Trinovids
7x35 Minolta
Edited by grbrown (06/16/07 06:11 AM)
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