MS Optics R&D Histrio-Prot 40mm f/6.3 MC
First lens of the MS Optical Historical Series Collection: small format version of the 1890 Zeiss Protar, Zeiss's first anastigmat design, which would later evolve into the Tessar. Maximum aperture f/6.3, which is fast for the design, thanks to the smaller format. Most vintage large format Zeiss Jena Protars (Series V) are f/16.
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