The only East Germany lens I had was the Carl Zeiss Jena DDR Flektogon 35/2.4. I didn't like it, preferring the Mosler Fotoguard (Tokina) 35/2.8 and the Pentax K 35/3.5. Now I have another one from East Germany. This is the Pentacon 30/3.5 with M42x1 mount.
PENTACON 3.5/30:
German Democratic Republic:
This lens is a later version of the older Meyer-Optik Görlitz Lydith 3.5/30 lens, which is interesting for its simple retro-focus optical design without cemented elements. There are only 5 elements in 5 groups (looks like a retro-focus Ernostar).
The Pentacon has the same optical design 5/5 (source):
Mine is the latest Pentacon 30/3.5 with a green ft. scale (from the 1980s, as far as I know).
Earlier Pentacon versions had a red one.
This is a preset aperture lens. The aperture ring is single, but it's outer part can be slid forward to set the limit of the aperture closing.
It locks at the following positions: f/3.5, f/4, f/4.8 (intermediate), f/5.6, f/6.7 (intermediate), f/8, f/9.5 (intermediate), f/11, f/16, f/22. The focus ring rotates from f/3.5 to the locked aperture without clicking.
A 10-blade aperture, but not round in shape.
The filter thread size is 49mm. This lens is quite small.
The minimum focusing distance is about 30-35cm, which is good for a non-modern lens.
I liked this lens. It doesn't provide very good resolution over the entire frame (on the Sony a7c, FF 24MP), but it has other interesting features. And it's an inexpensive lens. Perhaps it is unpopular because of the name (not Meyer-Optik) and the f/3.5 aperture.
By the way, there is a modern remake version called the Meyer-Optik Görlitz Lydith 30/3.5 II, but it's quite expensive.
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