Using Minolta Rokkor lenses with M-adapter

[UliWer]

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Before I bought my first Leica I had a Minolta X 700 and was very fond of the W-Rokkor 1:2.8/24mm. Every time I looked on old photos taken with this lens I regretted having sold it. Today I found a very good copy and a Leitz 22233 adapter (originally made to use the Minolta lenses with the Leicina).

Though I think there is a problem adapting this lens. The 22233 adapter does its job, but the lens has a small part which pressures on the adapter's flange. It can be seen here in the photo between the red dot and the "24" mark:

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This little part is so tight on the adapter's flange that you almost cannot change f-stops. It works with a lot of force though this isn't convenient. I don't think its a "fault" of the adaper, since the flange's surface is just flat. 

Anybody using Rokkor lenses with adapter on the M has had any similar experience? I already thought of filing off the little metal part so that it doesn't apply so much pressure on the adapter's flange, though before taking such radical measures I'd like to know if there is a better solution. 

[01maciel]

There are a few Minolta lenses out there of excellent quality. I have two Minolta lenses, MC W Rokkor 28mm 1:2 and MD 50mm f/1.2. Both are working well on my M10 with a Fotodiox adapter. Never heard about the 22233 adapter.

[UliWer]

vor 21 Minuten schrieb 01maciel:

I have two Minolta lenses, MC W Rokkor 28mm 1:2 and MD 50mm f/1.2. Both are working well on my M10 with a Fotodiox adapter.

Do you see the small metal part described above on your Rokkor lenses?

[pegelli]

I see similar metal parts on the aperture ring of all my Rokkor lenses (17/4, 45/2, 50/2 and 58/1.4).

I use them on my M246M with a K&F MD to M adapter and this metal part on all my lenses runs free from the adapter.

The metal part is probably there to communicate the aperture from the lens to certain Minolta SLR's and for use on your M cameras I think filing it off so it doesn't rub to your adapter is probably fine, but you might jeopardise the operation when the lens gets mounted back on a Minolta SLR.

Edited December 17, 2022 by pegelli

[jankap]

I have the 24mm MC and use it with a nameless adapter (MD -L/M) in manual mode. The black metal part of the lens runs free from the adapter. I have no idea what the function of this part is.

Edited December 17, 2022 by jankap

[pgk]

22 minutes ago, jankap said:

I have no idea what the function of this part is.

Meter coupling tab, similar the the Ai tab found on Nikkor lenses. I think that a good adapter will be machined so that the tab runs free. Why the 22233 binds is baffling since Minolta MC and MD lenses will have this tab. Personally I'd try to source a better adapter than the Leica one. 

[UliWer]

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I managed to file off just a fraction of a millimeter from this tab and and it was enough so that I can set f-stops normally now.

Thank you all for your help!

[pgk]

FWIW I think that Minolta MC lenses were so called because they were Meter Coupled - that tab!

[Pyrogallol]

3 hours ago, pgk said:

FWIW I think that Minolta MC lenses were so called because they were Meter Coupled - that tab!

I was going to say it was Multi Coated, but now I think you are right https://www.rokkorfiles.com/Lens History.html

Edited December 18, 2022 by Pyrogallol