Hello. I have just found this great site and have checked through the threads b ut don't seem to be able to find one that matches my enquiry. (sorry if it has b een previously covered missed it) I am shooting with a sinar f and have adjusted the groundglass to give spot on f ocus with my Wista 6x12 rf back (this back is great to use - no problems) howeve r, I often shoot 4x5 loaded into Fifelity holders, at the same time, switching b etween one and the other during the shoot. My problem is that I have to shift th e focus back (extended) by 1mm to ensure that the focus is ok on the sheet film. I can't work out how I can get around this - any ideas? It seems amazing that this discrepancy is so great. Anyone had simmilar experiences? Tha nk you, Paul Tomkins amaazing that
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