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However, to my knowledge Ed Zarenski's is the only performance index for binoculars that attempts to figure in the importance of the optical quality of the binoculars being compared. If you are attempting to compare binoculars of different optical quality, use EdZ's performance index!

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I agree, EdZ's index is more thorough and would certainly offer a better comparison between binoculars of different optical quality. The only concern i have is the practical application of EdZ's index by a novice (such as me).

I can quickly and fairly easily relate to both the Bishop Visibility Index and the Adler Index but would personally find it difficult to factor in such things as baffles, aberrations, contrast, light transmission etc. as required by EdZ's index. The deficiency here is in me, not the index.

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Celestron StarHopper 8" f/6 Dob
38mm Burgess 2" SWA | 30mm Ultima | 20mm Omni
17mm Hyperion | 12.5mm Baader Ortho
8mm TV Plossl | 6mm TMB/BO Planetary
Orion Shorty Plus barlow
15 X 70mm Skymasters

Saturn-like: desktop image

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