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1stScope
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Reged: 04/22/07
Posts: 44
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Re: Brightness in Exit Pupil
06/18/07 10:44 AM
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My impressions are that 'brightness' is like the blind men describing the elephant, where vignetting (one needs a larger, heavier optic to enable larger stops, prisms, etc. to minimize vignetting), coatings (better coatings enable more light transmission in general), and color transmission (obviously related to light transmission but looking at the visible spectrum) needs to be considered. I thought that the color transmission is more interesting as some optics with lower light transmission are perceived to be brighter due to the subjective impressions of the color transmission.
One can imagine the exit pupil being measured like the field on a camera lens in a typical technical review, where light falloff towards the edge of the field is measured, and where the transmitted spectrum is measured in visual instruments. Optics like camera lenses will tend to be better corrected for color as errors won't be tolerated as they are in visual instruments.
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