There is probably a reason why the convertibles should be used with the rear component when used as such. But there is a decisive advantage at using the front cell: the bellows extension is 25% shorter (acts like a tele lens). However, from examining two images taken one with the front cell, the other with the back cell of a G-Claron 305, it looks as there might be some haloing around the highlights on the one taken with the front cell. But I'm not certain this is from using the front cell, could someone confirm this? And what about screwing a UV filter into the missing element tread? Would it greatly affect the optical performance?
BTW, some lenses are not given as such but make excellent convertibles. I'm thinking of the Fujinon A. The 240 produces a good 420mm lens.
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