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Looking for information about prototype 92mm f2.8
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PostPosted: Fri Jun 21, 2019 6:47 am    Post subject: Looking for information about prototype 92mm f2.8 Reply with quote

Found this lens with batch of other lenses and can't find any info about it. It comes in unusual "4 screws mount", which is might say that this lens was used on some technical or special equipment. There is no name on it - only serial number and information about FL and aperture value.
This lens came with another, more well known lenses, in the same mount and design as: helios 33, ro3-3m, oks6-75-1, era-13 and few other. This 92mm has good enough back focal flange distance - to be used on dslr and mirrorless cameras.
Anyone know any information about such a lens? Will be appreciated for any help!