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2024-03-20

M42x1-M39x1 adapter (16.7mm)

I already have a modern M42x1-M39x1 adapter (M42x1 for a lens, M39x1 for a camera). This adapter is for non-standard lenses, it is thin/short (4.5mm). For example, I use it for a M40x1/44 lens.

But it is inconvenient to use standard M42x1/45.5 lenses with this thin adapter, because you should use an extension tube or something to compensate the flange focal length difference.

Obviously, there should be an adapter to mount M42x1/45.5 (SLR) lenses on M39x1/28.8 (rangefinder, without coupling, of course). But I never saw one until recently, when I bought one by chance.

Yes, it is for a M42x1 lens:




And for a M39x1 camera:




I don't know the origin of the adapter, if it is handmade or serial product. Its quality is good.

The most important thing is the length of 16.7mm (45.5-28.8). It allows direct mounting of M42x1 lenses without an extension tube.

This adapter (with the M39x1-FE adapter) on the right, the M42x1-FE adapter on the left:




Note that they are the same length.

And the Takumar 105/2.8 (II) mounted on the adapter (together with the M39x1-FE adapter).




The M42x1-M39x1 (4.5mm) adapter on the left, the M42x1-M39x1 (16.7mm) adapter on the right.




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