On my new F2, I ordered the fresnel lens, which sits atop the GG. I have to be looking quite DOWN at it, not head on, to get a bright view. Also, is that hole in the center there for a purpose? If I line myself up square to the camera it's pretty dark, only when I'm above center quite a bit is it brighter. Is that normal? Not sure if I should take it off and try without it, I hate monkeying with something already, only got it last night.
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