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Pete Ganzel | all galleries >> Tinkering >> 21mm_mc_rokkor_converted_to_sony-minolta_af_mount > M42 Mount Scribe 0137.jpg
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M42 Mount Scribe 0137.jpg

The M42 blank is threaded onto a Pentax Spotmatic and the top of the ring is scribed with a line.
This establishes a "standard top dead center".

Konica-Minolta DiMAGE A2
1/80s f/3.5 at 50.7mm iso100 full exif

other sizes: small medium large original auto
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