.... is there anyone out there that can detect that 6 percent difference? Really?
I would say everyone can, just depends on the circumstance. So take the scenario where a faint star is at the threshold of vision at the point where a 3% brightness change will bring it under threshold. Bet everyone will see that star no longer in the FOV. So would imagine we can come up with a number of circumstances were 6% will be noticeable. Certainly not all circumstances, but assuredly some.
But what is always puzzling to me is the lack of concern over the 6% at the eyepiece. If I am lax there, I guess I should not worry about the main objective that is 6% less that what I can get, or that one diagonal is 6% less than another? It is a chain...it all adds up. Remember...it only takes one weak link to break the chain. One should not trivialize transmission performance at any place in the chain IMO. As analogy, if one spends the money to get a high performance car, why would they ever want to put a low performance tire on it?? Geez...if 2 EPs have the same FL and AFOV and one has 6% less transmission than the other...who would want that retread!
Edited by BillP, 20 August 2014 - 01:54 PM.