Confused about 35mm Summaron f3.5 on M240

[hjddd]

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this len only works with LEICA ORIGINAL L-M adapter to get full range coupling。 

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1 hour ago, hjddd said:

this len only works with LEICA ORIGINAL L-M adapter to get full range coupling。 

That's not entirely true as I have this lens and a third party adapter that works perfectly. However, I had to go through a few to get one with the threads cut in the correct location. That said the original Leica adapter is probably a safer bet as they should have the threads cut correctly and not starting in random location.

[TomB_tx]

Here's my copy of that lens mounted on a Leitz adapter. Notice how the cutout area of the lens mount aligns with the cutout on the adapter where the camera roller moves when focusing:

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Now here's a cheap copy adapter, where the lens is not aligned so the cam can enter the cutout on the lens:

I have a number of adapters of different makes, and many align differently. I have 2 Kipon adapters, and one aligns correctly and the other doesn't. The adapters I have from Rayqual and Voigtlander all align correctly.

[rtai]

15 hours ago, Street imprints said:

Thanks so much for all the help! Im so happy to get help with this. This forum is awesome! I got it from Keh in "ugly" condition lol. It didn't really specify much else tbh. But it does seem the underside is kind of ugly. I'm starting to think it's the adaptor. I've ordered another one so I will update when it arrives. Im not sure exactly what they did or didn't do with the lens tbh. If the new adaptor lets me focus I’ll take it to get serviced. They wanted to charge me $45 to look at the lens, which is the same price as a new adaptor so seemed smarter to try that first in case I did need it. 

The lens doesn’t look Ugly at least cosmetically and the underside looks good to me. So it requires adjustments so the nice deal. I wouldn’t be surprised if this is the reason behind the UG rating. Is it already passed the return period? 

[TomB_tx]

The 3.5 Summaron is a very good tiny lens. I used mine on a IIIf to carry while in the Army in the late 1960s. Here's a quick snap on my M10 that shows the size and image contrast.

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A comparable alternative is the Canon Serenar 35 2.8 also of the early 1950s. It does not have the mount cutout like the Summaron, and so alignment of the adapter wouldn't matter as much:

Edited December 28, 2023 by TomB_tx
Correct Serenar to 2.8

[PastramiSandwich]

Any updates with the lens?

[vsantos720]

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I picked up a copy of this lens and have run into the same problem with adapting it to an M-mount, and not being able to close focus due to the adapter.  I've tried the Light Lens Lab 35 mm, as well as the 28 mm, and 50 mm adapters, and none align correctly.  I've also tried a Fotodiox adapter which is off by even more.  I've ordered a couple more from Amazon to test.  If those are a no go, I have to then decide to sell or find one of the more expensive adapters, but I'm not sure it's worth it at that point.

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[hjddd]

15 minutes ago, vsantos720 said:

我拿起了这款镜头的副本，在将其适配到 M 卡口时遇到了同样的问题，并且由于适配器而无法关闭焦点。我尝试过 Light Lens Lab 35 毫米以及 28 毫米和 50 毫米适配器，但没有一个能够正确对齐。我还尝试过 Fotodiox 适配器，但效果更差。我从亚马逊又订购了几个来测试。如果这些都不可行，我必须决定出售或找到一个更昂贵的适配器，但我不确定此时是否值得。

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No third party adapter can be used perfectly， you shall  buy an original one 

[vsantos720]

4 minutes ago, hjddd said:

No third party adapter can be used perfectly， you shall  buy an original one 

That's my fear.  A quick search on eBay shows that an original Leitz will cost around 100 USD, plus shipping/tax.  

 

[romualdo]

1 hour ago, vsantos720 said:

That's my fear.  A quick search on eBay shows that an original Leitz will cost around 100 USD, plus shipping/tax.  

 

The prices of those original Leitz adapters has increased significantly - I bought a bunch (4 IIRC) about 4-5 years ago (via Gumtree) here in Australia for $A70

[vsantos720]

On 4/5/2024 at 10:12 PM, hjddd said:

No third party adapter can be used perfectly， you shall  buy an original one 

Update:   I cleaned the threads on the lens mount and the mounting surface on the lens, and the LLL adapter is now fully functional and I have rangefinder movement all the way down to where the pin stops the lens from rotating further.