I managed to break the groundglass on my Sinar F2 earlier today. A bummer, as I've booked a long weekend next weekend to explore an area new to me. However, I've replaced it temporarily with one from a Toyo, and ordered one from a Chinese supplier on ebay. My question, though, is whether there is any focus shift that can or will occur, and if so, what adjustment if any I can make?
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