What size filter does a Turner-Reich triple convertible (12-19-25) use? When converted, should I put the filter in place of the missing front element, or screw it to the rear? I was trying to find lenscaps for it but it seems to be somewhat closer to 54mm than 55, for a snap cap. It needs a 58mm slip-on (the one that came with it is a 57mm, which is a bit stretched but stays on).
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