On LF forum, there are a few threads around some issues with the way Chamonix has installed their fresnel and GG's. Apparently, there is a focus shift after focusing with the factory installed fresnel, which is installed in front of the GG, and then inserting the film holder. The focus plane shifts to make noticeable lack of sharpness on some images. Especially when shooting at larger apertures. Apparently, by moving the fresnel screen to the back, the problem should be mitigated. I am not fond of the vitriolic nature of LFF so I am asking my question here. I was wondering if the more friendly Chamonix users on APUG have seen this problem on their Chamonix cameras?