One of the most unique lenses I have ever owned. This one is call the Bokeh Monster for good reason. Beautiful glass out of West Germany accompanied by a textured 15 blade (de clicked aperture) make this lens a stunner. The lens comes with an adapter for M42 to Sony E-Mount. Here are some examples of what people make with these lenses:
https://www.flickr.com/photos/tags/pentacon 135mm f2.8
Price is $300
https://www.flickr.com/photos/tags/pentacon 135mm f2.8
Price is $300