<p>Today I went to my favorite thrift shop, since they recently had a lot of analog photography stuff, and lo-and-behold, they finally had some SLR gear. A Praktica MTL5, still in its original box, with a Pentacon Multi Coated Auto 1.8 50mm lens, Praktica strap, leather case, flash cable still in the plastic bag, and the manual for €5, a Brownie Six-20 Model E, in leather case with manual and paper invitation card to the Brownie Club Netherlands for €5, and then a big leather bag with a Praktica IV F, different filters, and quite a few M42 lenses, which costed me €10. The lenses in question are: Auto Edixon 2.8 35mm lens, SMC Takumar 1.8 55mm lens (some fungus, should be treatable), Hanimex Tele-Auto 3.5 135mm (pretty bad fungus, might not be worth attempting to save), and then the lens this thread is dedicated to, the Jena Bm 2.8 80mm M42 lens. From what I understand, Bm stands for Biometar, and this lens is said to be rare and valuable. But I can't find any images online of this specific M42 variation that only is marked Jena and not Carl Zeiss Jena, and Bm instead of Biometar. Anyone got a clue what I have on hand here? It looks to be clean and I can't really see any signs of fungus. Thanks!<br>
<img src="http://oi64.tinypic.com/p3wqt.jpg" alt="" width="369" height="384" /></p>