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Zeiss Ikon Nettar II type 517/16 — Simon Hawketts' Photo Blog
The Zeiss Ikon Nettar II model is a fairly basic design with a 75mm Novar-Anastigmat lens, a maximum aperture of f/6.3 and the vario shutter has quite slow speeds of 1/25, 1/75 & 1/200sec + a bulb setting.