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How fickle this group is!

Just last week, I posted about how exit pupil per se doesn't really matter, and people jumped all over me, saying that binos with small exit pupils aren't worth considering for astronomy.

And now we have this thread singing the praises of small-exit-pupil binos to the high heavens.

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We are talking about a binocular here that fully illuminates the exit pupil across the entire field from more than 80% of the entire objective diameter. I've never seen any other binocular that does that. That's more than TWICE the norm for a typical binocular and in fact is 5x to 8x some binoculars. Other "best" binoculars fully illuminate the exit pupil from 50% of the objective diameter. Typical 10x50s and 8x40s fully illuminate the exit pupil from about 20-30% of the objective diameter. Roof prism binoculars fully illuminate the exit pupil from only about 10-20% of the objective diameter.

When you look at all the light entering across the field of view from a typical binocular, beyond about 30%-35% of the central area, light diminishes from 100%to perhaps less than 25% by the edge of view. When you look at all the light gathered across the field of view in the Takahshi 22x60, nearly every photon is delivered across nearly the entire exit pupil.

No other binocular I have ever seen does so much with so small an exit pupil. I have no doubt in my mind the illumination, and therefore brightness, of the Tak22x60 results in it performing well above its exit pupil size class. In fact it may even perform as if it were 1/3 to 1/2 again larger.

Tony, sometimes you have to look at the qualities that contribute to performance rather than look at a simple number that doesn't tell the whole story to argue a point. I've been saying for a long time that comparing exit pupils is not a "complete" indicator of the brightness of a binocular and there is more to it than that. The Tak22x60 is the finest example to illustrate that concept.

edz

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