CARL ZEISS JENA 28mm f/2.8 Praktica B Mount

[ncmcolt]

Would like to clean my practika lens, mould inside, but not certain how to go about it. There are no screws for the rear mount, so does it mean I have to go through the front of the lens. There is nothing on the net I can find about the lens. I know it is old but very sharp and served me well. I would be thankful for any help

 

[killwilly]

Would like to clean my practika lens, mould inside, but not certain how to go about it. There are no screws for the rear mount, so does it mean I have to go through the front of the lens. There is nothing on the net I can find about the lens. I know it is old but very sharp and served me well. I would be thankful for any help

The link below is for the 50mm M42 fit, perhaps yours is similar.

http://oomz.net/tessar/

 

[ncmcolt]

CARL ZEISS JENA 28mm f/2.8 Praktica B Mount

This is helpful.
I did manage to disassemble the lens. Compared to most other lenses this Jenna was easy only 7 hefty screws. At the rear mount is a plastic cup that simply pulls out revealing four mount screws. This made it easy to get to the back of the lens. Aligning the helical focusing barrel is now the challenge.
Trial and error. Trial and error....
Thanks for the reply. That website is in my files

 

[Apple fanboy]

This is helpful.
I did manage to disassemble the lens. Compared to most other lenses this Jenna was easy only 7 hefty screws. At the rear mount is a plastic cup that simply pulls out revealing four mount screws. This made it easy to get to the back of the lens. Aligning the helical focusing barrel is now the challenge.
Trial and error. Trial and error....
Thanks for the reply. That website is in my files

Your a braver man than me. Good luck!