This is a thin adapter for M42x1 lenses and Sony FE/E mount cameras.
Often such adapters are very thin: 1-1.5mm, but this one is the rare 5mm version:
It's not just an adapter for M42x1 (like this one). It is an adapter with a short flange focal distance. In this case it's 18mm (Sony FE/E) + 5mm (the adapter) = 23mm instead of the standard 45.5mm for M42x1 lenses. This means that a standard M42x1 lens focuses beyond infinity.
Such thin adapters are used for various experiments and homemade things (adapted lenses, macro equipment, etc.). I use it for a rather rare old lens (with a simple adaptation).
See also related notes:
- M39x1/44: Braun [Super] Paxette II lens mount (2023-09-20)
- Praktiflex M40x1 lenses on modern cameras (2023-08-25)
- M42x1-M39x1 adapter (4.5mm) (2023-08-15)
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