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Dark adaption and using binoculars.

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#1 davidmcharg

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Posted 16 July 2005 - 10:35 AM

Over the last 2 years of observing with 2 pairs of binoculars (Nikon 10x42, Zeiss 8x30) i have consistently noticed that when i first head out and i am still dark adapting i find it much easier to use the 8x30's than the 10x42 and i cannot exactly put my hands on what it is.
Specifically i find it easier to take in the full field of view of the 8x30's and then after a few minutes the nikons are perfect but it always takes a few minutes.

Any reason why this would be ? Just curious.

Thanks
David.

#2 HfxObserver

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Posted 16 July 2005 - 11:14 AM

Exit puil of the 8X30's = 3.75 the 10X42's = 4.2
When you first head out you are still dark adapting so have smaller exits pupil as your eye adapts the pupils get larger.

-Chris

#3 Alan French

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Posted 16 July 2005 - 05:23 PM

Your eye's pupil opens up in a matter of seconds, so that can not be the difference. The production of visual purple that greatly increases the retina's sensitivity is what takes some time.

Clear skies, Alan


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