Sorry for my silence; been too busy the latest couple of days.
Just to clarify. I did a test to verify that the GG vs film-plane distance is ok. For that purpose I built a test-rig, see below
I used a piece of sheet aluminium onto which I glued a high-contrast target. There is also a "ruler" that is slanted by 45 degrees in the z-direction (= optical axis). The zero mark on the ruler is aligned with the aluminum plate (not very clear in this image, but they are). I set-up my camera an focused on the plate/zero mark, using a very sturdy tripod and a focusing loupe (and of course the GG+fresenel combo (Wista original by the way)). After exposure, I verified that the focus was still spot on. Attached below is a close up on the resulting sheet-film negative.
It is a quite lousy scan, but as far as I can tell, the focus is pretty spot on, right? I don't think I have a problem with GG alignment!
Next-up to test is my enlarger setup...
By the way, how to verify that the taking lens of the camera is properly assembled in terms of disance between front- and back- module?
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