April 2013: Refurbishment of a batch of lenses

Together with the "Olympic" Zenit EM I received this lot of lenses to repair.

Mir 38b 3.5/65mm (Pentacon Six mount) with Canon EOS adapter

The Pentacon Six -> Canon Eos adapter was stuck, and the attempts to remove it damaged the lens: the optical block was left out of the helical, it's guides distorted as well as the diaphragm.
First disassembling of a diaphragm, with the blades to put back in place, to rectify the moving part.
Then, full reassembly with focus adjustment to infinity, and remanufacturing one screw of the mount.

Voigtländer Apo-Lanthar 3.5/90mm SL (Pentax K mount)

The diaphragm does not work.
Second disassembly to repair the (plastic) mobile part by gluing a small piece to replace a broken guide.
And the blades to set back into place one by one!

Asahi-Pentax Super-Takumar 1.8/55mm

Play in the barrel, due to loose screws.
Disassembling-tightening-reassembling.

Schneider-Kreuznach Edixa Tele-Xenar 3.5/135mm

Diaphragm blocked, the blades are stuck with oil, the command is twisted.
Guess? Yes, all diaphragm blades to take out, clean, and refit!
And the command to untwist.

Steinhell München Edixa Auto-Cassaron 2.8/50mm

The diaphragm does not work.
On this lens for Edixa, like for the 135mm above, the iris control is different from the M42 lenses we well know: here the coupling "finger" comes out more or less depending on the chosen aperture. If you force (eg by trying to use it on a Zenit EM or TTL, or with an adapter ring having a flange to close the diaphragm) you break it!
Here, not too serious, the command had just jumped. No need to disassemble the diaphragm, phew!

Tamron SP 3.8-5.4/60-300mm (Adaptall for Canon EOS)

Stuck

The complex mechanism of pump zooms is made of tubes shifting ones inside the others, connected by small plastic bearings guided by rails.

I made a bearing to replace two broken pieces.
The zoom will remain a little tough, it should be necessary to disassemble everything to replace the deteriorated grease (it doesn't happen only by Russians!) and there is too much risk not to succeed in reassembling, or to damage lenses.