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Message: <blockquote data-quote="BobinKy" data-source="post: 1580215" data-attributes="member: 58027">Frank...I am sure you are well aware of this rule of thumb--the peak eyepiece for any scope is the eyepiece that returns close to a 2.0mm exit pupil. Another rule of thumb is the best eyepiece for any scope is the eyepiece that provides the most detail while filling the FOV.However, I think the above rules are speaking of fully lighted objects, not objects in low light. I have never run across a similar rule of thumb for low light--perhaps it might be a 3.0mm or greater exit pupil for scopes in low light nature viewing. For binoculars--that is what we are debating (I think?).. . .And yes, I think we carry around in our head what makes our "best" view and we know it when we see it. I have tried to quantify my "best" view in my personal notebooks as far as my words allow. All I can say with any certainty is my "best" view is, as I stated earlier, a balance of light, life (object), and environment (surrounding). For me, the light comes from exit pupil size of 5-7mm, the life (object) comes from sufficient detail to permit the object to be itself in the eyecups, and no more detail because too much detail complicates everything, and the environment (surrounding) comes from an FOV that allocates no more than 1/3 to the object itself....BobKentucky</blockquote>