From #45 above,
Maljunulo post 43,
You are right: transmission is not equal to brightness. That is often a matter of confusion, therefore I have written a review paper entitled "Color vision, brightness, resolution and contrast in binocular images", a review of published data" , May 2013, 30 pages. It can be found on the WEB-site of House of Outdoor.
Gijs van Ginkel
In addition to the paper Gijs refers to, he and I had an exchange some months back when I was struggling with the distinction between transmission and exit pupil. Assuming others may be wondering, with his OK, here it is...
9/26 - me
"Thank you Gijs,
I bow to your expertise, easily. Here's why I was thinking... maybe?
I get 90% light transmission measured for a particular binocular means 90% of light passes from front to back, period, full stop. That is a quality of that bino, doesn't have anything to do with whats happening outside the unit. 90% of available light makes it through. Right?
As well that bino has an exit pupil. So same bino, 2 different attributes. But don't both have to do with what I see? If things are heading towards dark, (late afternoon), available light starts to diminish. The bino still provides 90% of that. Combo of its EP and my eyes ability to dilate effects how I perceive it, though. 90% of less light would seem er.. darker, while the ambient light, EP/pupil thing is the actual.
Hmm, maybe I just answered my own?
Tom"
10/7 - Gijs
"Tom,
You hit the nail on the head,
Best regards,
Gijs"