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Original name for a Zeiss designed lens from the 1890's Zeiss could
not reserve the name and so renamed them Protars. Lots of makers
subsequently used the Anastigmat name. If the one you have is based
on the Zeiss lens design it was an OK lens. In 14 inch it probably
covers 8x10 and maybe 11x14" formats.
Probably suitable for contact printing may not stand p to enlargment.
At f5.6 it is a rather heavy lens to mont on your camera.