So called 'dual mount' Leitz lenses.

[Dralowid]

Just checking...

I'm aware of the dual mount 35mm Summaron 2.8, I have one.

I also know of the dual mount 90mm Summicron 2.0, I used to have one.

Are there any others? For example I have not seen a dual mount 50mm.

By 'dual mount' I mean lenses made during the period when both ltm and m were available (and maybe a little later). The lenses look like the M version with red dot etc but they have a dedicated adapter ring that can be unscrewed (with the removal of a grub screw) to make them ltm.

They may not want to come apart...

 

[Crazy Fedya]

I have seen 8 element Summicron 35/2, that was dual mount. Also, 35/3.5 Summaron.

 

[WJJ3]

Just checking...

I'm aware of the dual mount 35mm Summaron 2.8, I have one.

I also know of the dual mount 90mm Summicron 2.0, I used to have one.

Are there any others? For example I have not seen a dual mount 50mm.

By 'dual mount' I mean lenses made during the period when both ltm and m were available (and maybe a little later). The lenses look like the M version with red dot etc but they have a dedicated adapter ring that can be unscrewed (with the removal of a grub screw) to make them ltm.

They may not want to come apart...

I remember seeing these being called ‘convertible’ lenses somewhere. Can’t remember where. I wasn’t aware there is a convertible mount 90mm. That’s interesting.

The 35mm convertible Summicrons and Summarons come up for sale from time to time. I think the convertible Summaron is one of the coolest lenses Leitz made. The one with the mounting index dot on the removable mount.

 

[Dralowid]

The red index dot on mine is on the lens, the adapter flange is too narrow to take it.

 

[Vince Lupo]

A very small number of the 90/2 Summicrons did not have the red dot, though they did come with an M-mount. This was during that transition period you refer to, and the Leitz factory literally glued the M-mount onto the lens. Usually they were only removable by applying heat to them, but the glue on mine dried out to the point where it could be unscrewed without a lot of effort.


soozi1 by Vince Lupo, on Flickr


soozi1 by Vince Lupo, on Flickr


soozi4 by Vince Lupo, on Flickr

They seemed to happen around the 158xxxx serial number range. Code name SOOZI, and they had the separate lens hood. Apparently only 490 of them were made.

 

[Rob-F]

I had a 50mm Summarit with an adapter that I couldn't get off. Sherry Krauter couldn't get it off, either, and she thought it might have been glued on at the factory!

 

[Vince Lupo]

I had a 50mm Summarit with an adapter that I couldn't get off. Sherry Krauter couldn't get it off, either, and she thought it might have been glued on at the factory!

Rob did that Summarit have a red dot?

 

[Rob-F]

Rob did that Summarit have a red dot?

It's been a while, but I think the red dot was only on the adapter.

 

[rodt16s]

Also seen a 35 summicron v1
I have the Summaron dual mount, but the adapter isn't in any hurry to budge

 

[Dralowid]

Also seen a 35 summicron v1
I have the Summaron dual mount, but the adapter isn't in any hurry to budge

Have you found the tiny grub screw?

 

[Dralowid]

Interesting, the 90mm Summicrons have a glued on normal adapter (Vince's and mine had) but the 2.8 Summaron has a different beast altogether which I assume is specific to the lens.

 

[rodt16s]

Have you found the tiny grub screw?

Yes, I have removed the grubscrew, but it even with a bit of force it was stuck.
The lens is long overdue a cla, so I'll request fixing the mount as part of it

 

[mothertrucker]

Super Angulon 21mm F4 is dual mount with a grub screw. Great way to get a screw mount super angulon.

 

[Dave Little]

The red index dot on mine is on the lens, the adapter flange is too narrow to take it.

M2- LTM 2.8/35 by Dave Little, on Flickr
The Red dot is on this one is on the adaptor about 90 deg around from the tiny grub screw.

 

[Dralowid]

Chewed up grub screw to the right, red dot on lens body just visible on the left. So two versions of the same lens.

IMG_1424 by dralowid, on Flickr

 

[Ronald M]

I recall a special run of 35 2.0 and 50 2.0 dual mounts made maybe 20 years ago sold only in Japan. Do not quote me on the date.

 

[kiemchacsu]

revive this old thread,
currently i bought an Leica IIIf, so wondering is this lens can be remove the M mount to be used on my IIIf, thank you.
Pictures below:

 

[splitimageview]

Look for this grub screw.

 

[rfaspen]

If the tiny grub screw shown in post above isn't there....it is not possible to use on LTM body. I see people often confusing the larger screw as the one indicating a removable mount. I've had people get defensive when I politely point out the simple mistake. But, It is the tiny one that allows M- mount removal.

 

[Dralowid]

Ah, that was my lens, now sold. As can be seen from the state of the screw they may not be that easy to remove.

Beware, I have come across one which had also been glued, needed a fair amount of heat to remove.

Anyway, when all said and done an M lens with its red dot just doesn't look right on an LTM camera (in my opinion)