Omid,
In my last post you will notice the z8i lasted twenty minutes longer than three good scopes; and 31 minutes longer than a Swarovski z6. What do you think allowed this. By the way, both the owner and I agreed when the scopes went down.
Hi Rigman,
My comments above don't contradict your observation. The Z8i's exit pupil is sufficiently large for low-light observations at low powers (8mm is still larger than max dilation of human eye pupil) and at high power it will act like any other scope and its brightness will depend on the "actual" objective size. The Z8 scope you tested had a 56mm objective lens compared to 50mm in others. A 56mm objective collects 25% more light than a 50mm objective (lens area is 25% larger) so it will look brighter at medium/high power. What power did you use for your observation? Did you compare all three scopes at same power, say 10X?
-Omid
