This answers a lot of my questions, I've had a very frustrating month with this problem. My Chamonix 45N arrived in May, and most of my photographs are very much out of focus. I shoot mainly landscapes, so am focusing on infinity, but am also shooting them at night, so need the faster apertures, or else I'm standing for 45 minutes to take a single photograph. I know they're in focus on the GG, this I can see quite clearly through my loop, but so far only shots at F16 are beginning to approach being in focus.
One additional problem I've noticed is that the film plane and GG/Fresnel plane are not parallel. I have about 20 sheets, all shot with various lenses, various new film holders, and at various apertures and all of them show the image more in focus on the far right side and less in focus on the far left side. This consistency seems to indicates a problem worse than just Chamonix not compensating for the Fresnel thickness in placing the GG. Given that I seem to be the third person in a few weeks to notice this, has anyone else seen this?
I do trust that Chamonix will help resolve this (I only emailed Hugo about this today), but folks have mentioned about sending their cameras in to be "calibrated". Who does this sort of calibration?
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