Questions about Rokkor M 28mm.

[Coldeye]

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Got this lens for a pretty good price online, it has a bit of the white spot problem but everything seems pristine, but I do have a few questions. I currently have a leica m240 and a leitz minolta CL for my film needs. For those who have used this lens on the M, what frameline does it bring out when mounted? I hear reports of it bringing the 35mm frame but I am not sure. Also for the CL, is the whole view of the viewfinder close enough to 28mm? Thank you all.

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[a.noctilux]

I don't have this 28mm anymore.

 

When I had it years ago with my CLE, if the Rokkor M 28mm was mounted on an Leica M, the framelines was 35mm.

Logic things as Rokkor 40mm brings 50mm framelines, and Rokkor 90mm brings  90mm on M.

[luigi bertolotti]

I can answer only about the Viewfinder : when I used my CL, mounted on it, time to time a 28mm (the Summaron 5,6) : the VF is not large enough,so I preferred to keep with me an external : of course, is not a big difference, so one can make, with experience, a decent guessing.

[Coldeye]

I see. Is it like with the 40mm, shaving a tiny bit of the tab, or is it the opposite? If the CL viewfinder is about 30mm equivalent I can. Live with that.

[lct]

Yes the M-Rokkor 28/2.8 brings out 35/135 framelines on the M240.

 

I see. Is it like with the 40mm, shaving a tiny bit of the tab, or is it the opposite?

 

The opposite sorry. Only way would be to replace the 28/2.8's flange by that of the M-Rokkor 90/4 which brings out 28/90 framelines. Its  screw holes look at the same place but i never tried to do that so far.

[lct]

On 5/28/2018 at 11:25 AM, lct said:

Yes the M-Rokkor 28/2.8 brings out 35/135 framelines on the M240.

 

 

The opposite sorry. Only way would be to replace the 28/2.8's flange by that of the M-Rokkor 90/4 which brings out 28/90 framelines. Its  screw holes look at the same place but i never tried to do that so far.

Just tried this: does not work at all. Only way to bring up 28mm framelines is to modify the 28/2.8's flange then.

[sinjun]

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13 hours ago, lct said:

Only way to bring up 28mm framelines is to modify the 28/2.8's flange then.

I wedge the frameline selector with a bit of folded paper.

Nice lens but sees less use since I got the Summaron.

[lct]

2 hours ago, sinjun said:

I wedge the frameline selector with a bit of folded paper [...]

I should have said that the only way to bring up 28mm framelines is to modify the Rokkor 28/2.8's flange on cameras, like the OP's M240, having no frameline selector. My own copy of that lens has such a flange with 6-bit coding and it works fine on both M240 and M11 bodies. JFI.

[Alberti]

Ict, does the lens still have the 35 frame? Then what is used for the code?

I find that the lens needs no code to supress the smearing other 28’s have. Negligable. 
I heard (Will van Maanen) that a 28mm replacement bayonet is available . . But at €150_200 a bit expensive. For a lens that cost me € 350. But the quality on the M10R and M240-P is outstanding. It should be my favourate lens like the 40mm I like so much. 
A repair shop in the UK said they could paste a small piece of metal with dentists two-component glue to the existing flange to fill up the space to engage the 28mm frame. That should work. I’ld rather use some silver solder as glue but I’m stupid.

[lct]

1 hour ago, Alberti said:

Ict, does the lens still have the 35 frame? Then what is used for the code?

My copy has a modified flange with 28mm frame and Elmarit 28/2.8 pre-asph's code. I don't know whom did the mod though as it is a pre-owned copy.

[Alberti]

Thanks. I found  M-mount and 6-bit flanges on the net, but with 6 screw holes, but the sellers (Aliexpress) have NO IDEA for which lenses/models the flanges are . .  

   The thickness is not universal and the hole spacings are neither. So I wonder. A custom made flange is too expensive (I once asked Skyllaney, they gave a too high quote).

[lct]

The flange of the Rokkor 40/2 for Minolta CLE is a screwing one having nothing to do with flat ones one can find on e**y or elsewhere. I could not even interchange it with that of the Rokkor 90/4. 

[lct]

1 hour ago, lct said:

The flange of the Rokkor 40/2 for Minolta CLE is a screwing one [...]

I meant Rokkor 28/2.8 sorry.

Edited October 12, 2022 by lct