I need help with a Summicron-R 50

[Massimiliano]

I have an old Summicron-R 50/2, from a Leicaflex I: the focusing ring is stiff, so i've tried to dismantle the lens and lubricate the helicoils.
There's not a guide on the web, unfortunately.
I've removed the two little screws in the pic, and... disaster!
Now the aperture ring is not working, the focus is locked or semi-locked (very stiff).

Ok, i'm a donkey: but this isn't my first time with a lens, and Audaces fortuna iuvat. "Fortune favors the brave"? Uhm...🙁

Can someone please explain to me how to deal with this mess?
Thanks a lot: i love my Summicron, and feel very guilty for this crime. Grazie!


Massimiliano

 

[Vickko]

I don't have this lens, but I am guessing that you need to disassemble it from the rear. are there screws in the bayonet mount? Take them off first.

Is there any way to re-install the two screws that you removed, and then begin again?

Leicaflex lenses also had an annoying tendency to hide screws under the front name-ring. You may need to carefully remove it (and they may be glued on - so, dissolve the glue first with a solvent).


Vick

 

[nobbylon]

It's been a while and I've only ever done the later ones. Tke the name plate from the front and there are 3 maybe 4 screws under there holding the focus barrel onto the focus mount. Take this off and hopefully you will be able to figure out the 2 screws you removed. My guess is that they are to do with infinity focus and need to be aligned with the barrels before replacing the screws.

 

[Massimiliano]

Thanks, Vickko and nobbylon.
There are 6 screws on the bayonet mount. The two little screws i've removed from the barrel are reluctant to re-enter their site: I will try this again tomorrow.
My Summicron belongs to the first series, with the "inclined" nameplate (at the left in the photo).

(to be continued 😉)
Massimiliano

 

[Massimiliano]

Not very easy...
I'missing somewhat about the separation of the external barrel from the inner element (with the helicoils).
Some pics, waiting for the right intuition.

 

[Massimiliano]

Other pics

 

[Massimiliano]

Lens + barrel

 

[Massimiliano]

Ok... I can't do it, I give up!
How can I go on with this barrel? I don't see any screw or other fasteners.
Suggestions?

Thanks

 

[Massimiliano]

Nobody has an idea? :bang:



THANKS!

Massimiliano

 

[Landshark]

Yeah, this isn't going to help much but all those rings have got to unscrew.
It wasn't grown from a seed.
If it makes you feel like you're not alone, I just made a manual focus lens from an autofocus lens

 

[Massimiliano]

Thank You, Landshark.
I can't understand how to unscrew and separate the barrels, since they are rotating freely.
Manual focus lens from an autofocus? Very interesting!