Summaron 35 f3.5 help

[RemiG]

Hello from France! I manage a to find a summation with hazed for a a very cheap price. I tried to clean to a point in now stuck!
I manage to arrive this far but can’t figure out what the next step to free the front or back lens to clean.
Any ideas?

 

[Erik van Straten]

Hello from France! I manage a to find a summation with hazed for a a very cheap price. I tried to clean to a point in now stuck!
I manage to arrive this far but can’t figure out what the next step to free the front or back lens to clean.
Any ideas?

You'll need some flexiclamps, made by Nobbysparrow in Japan. Available on eBay.

 

[jc031699]

No flexiclamps will help there
If you see the thread I mentioned above, those are press fit innermost front and rear lens assemblies. I describe how I was able to get them out.

Step 10 here:

Leica Summaron 3.5cm f3.5 LTM lens optical unit CLA

I had a heck of a time getting this lens open and worked out, so thought I would contribute to the hive mind by describing the process. This is lens serial number 751928. Pretty sure it had not been opened or cleaned since it was made in 1953ish. I did not overhaul the helicoid, as it was...

www.rangefinderforum.com

 

[RemiG]

thanks for the support! So you basically heat the whole piece and then tap it to get the lens element out? No screwing or anything else ?
I’ll give it a try this evening

 

[Arnold Layne]

thanks for the support! So you basically heat the whole piece and then tap it to get the lens element out? No screwing or anything else ?
I’ll give it a try this evening

What jc031699 said. I didn't heated the block. Just tapped gently (a lot) on a hard surface and slowly came out.

 

[RemiG]

Thanks a lot it works perfect! No need to heat it!

 

[kenjim]

I could work a bit more in this. Still unsuccessful....:

1. I removed the tiny grub screw under the name plate. Unscrewed the front silver ring.
2. Removed the three screws to lift the aperture index ring.
3. The same with the two pins that holds the ring that operate the aperture. Careful with the two ball bearings.

And that's it. When I try to unscrew the rear retaining ring (wich requieres a lot of strength), the whole optical block rotate (dashed line). I'm stuck here.

View attachment 4837975

Hi,
I am trying to unscrew the first ring

I could work a bit more in this. Still unsuccessful....:

1. I removed the tiny grub screw under the name plate. Unscrewed the front silver ring.
2. Removed the three screws to lift the aperture index ring.
3. The same with the two pins that holds the ring that operate the aperture. Careful with the two ball bearings.

And that's it. When I try to unscrew the rear retaining ring (wich requieres a lot of strength), the whole optical block rotate (dashed line). I'm stuck here.

View attachment 4837975

Hi,
I am trying to repair a defective Summaron lens. After I removed the small screw from top the first ring (1) is still stuck. Is the ring (1) only screwed onto the thread?

 

[jc031699]

Hi,
I am trying to unscrew the first ring

Hi,
I am trying to repair a defective Summaron lens. After I removed the small screw from top the first ring (1) is still stuck. Is the ring (1) only screwed onto the thread?

Please post photos of which ring you are describing

 

[Erik van Straten]

I would use a bit of grease (vaseline), not oil. Oil will get anywhere, but vaseline stays where it is put.

 

[Kev H]

Hi
Sorry to exhume this issue so late on but I've just found the thread after attempting to refurbish an old LTM 35mm Summaron.

It looks like Genghis Khan has been in here but everything looks serviceable if I can only work out how to get the lense out.

I've got the lens stripped down alright and I'm looking at two lock rings at the rear and maybe one at the front, or else it's the push-fit version. How can I tell?

Many thanks.

 

[WingLTM2]

Hello,

I was reading your discussion about the Summaron 35mm f/3.5, and I noticed that you initially had difficulty removing the rear section but later managed to resolve it.

I am currently servicing the same lens and seem to be encountering a very similar issue with the rear assembly. I would like to ask if the correct first step is to unscrew the outer retaining ring at the rear.

I have already tried using a proper lens spanner tool and applied a significant amount of torque, but the part does not seem to move at all. I am therefore wondering if I might be approaching it incorrectly, or if there is a hidden locking mechanism, reverse thread, or any specific technique involved.

Could you kindly share how you managed to disassemble the rear section, and whether there are any precautions or specific steps I should follow?

Any guidance would be greatly appreciated.

Kind regards,
Wing

 

[Arnold Layne]

Hello,

I was reading your discussion about the Summaron 35mm f/3.5, and I noticed that you initially had difficulty removing the rear section but later managed to resolve it.

I am currently servicing the same lens and seem to be encountering a very similar issue with the rear assembly. I would like to ask if the correct first step is to unscrew the outer retaining ring at the rear.

I have already tried using a proper lens spanner tool and applied a significant amount of torque, but the part does not seem to move at all. I am therefore wondering if I might be approaching it incorrectly, or if there is a hidden locking mechanism, reverse thread, or any specific technique involved.

Could you kindly share how you managed to disassemble the rear section, and whether there are any precautions or specific steps I should follow?

Any guidance would be greatly appreciated.

Kind regards,
WingView attachment 4889857

Hello Wing, welcome to the forum.

You have to remove ring #2:

 

[WingLTM2]

Hello Wing, welcome to the forum.

You have to remove ring #2:
View attachment 4889860

Hello Wing, welcome to the forum.

You have to remove ring #2:
Thanks a lot. I did it finally 🙂