Originally posted by gatorguy As for the OptiBrite option I think it generally brightens the view especially at smaller apertures where the standard Katzeye may start to noticeable darken. The trade-off with with OptiBrite is the split circle will be harder to see at wide apertures if you're using lenses like the D FA100, *200 or perhaps even *300 and other fast equivalents. I'm a bit up in the air about the wisdom of adding OptiBrite myself since the DA*200 is one of my most often used. But I also tag it with a 1.4TC or 1.7TC or even both on occasion so I'm just guessing it'll be the right choice for me.
I think that the Optibrite treatment affects only the matte area of the screen, making it brighter in appearance at smaller apertures (than it would otherwise appear at smaller apertures) -- I do not think it affects the central focusing aids. [Someone please correct me if I am wrong.]
I think that the Optibrite treatment may also exaggerate the metering error a bit more than the standard screen does. [Someone please correct me if I am wrong.]
I ordered mine this time without the Optribrite treatment (partly to same money, and partly to minimize metering errors). Some of my lenses are fast (some MF, some AF), while some of them are slower (some MF, some AF), but I'm not expecting a significant problem with dark screens... [I may be proven wrong, of course.]