I've finally narrowed down which lenses I'll need to build a LF system based on my shooting style in 35mm and 6x7. Carrying around a viewing frame for the last month has helped as well (for which I sure got a lot of strange stares). The lenses are the 55/75/135/210/300 Rodenstock's (although I am seriously considering the 72XL instead of the 75, but the weight may be an issue). My concern however is with the 300mm. It has a front thread of 100mm. So it looks like I will need a step-up ring from 100 to 105mm in order to use CC filters and polarizers. B+W make such a step-up ring, but in a 1.0mm thread pitch and 0.75mm thread pitch. Does anyone on this forum using the 300mm Sironar-S know offhand which is the correct thread pitch? They are a special order item from B&H taking 6-10 weeks, so I really need to get this one right the first time.
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