I recently picked up a Schneider Symmar Triple Convertible lens with the normal focal length being 210 mm and the converted lengths being 325 mm and 405 mm. The lens is made up of a front and rear element with non-interchangeable threads, both mounted in a Compur shutter. What I don't know is how exactly to convert it, and I haven't been able to find anyone else asking this same question about this lens here or anywhere on the interwebs.
It seems that one removes just the front element for one of the alternate focal lengths and removes the other for the other. I tested it yesterday doing this on a distant object and that seemed to be what made sense. but I do not know for sure.
Does anyone know these lenses?
Thanks,
Adam
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