Additional information:
The Pentacon AV 80mm f2.8 is projection lens for 35mm Slide Projector.
No filter mount, no aperture and no helicoid. It was used in 35mm slide projectors with 42,5mm mount. Its optical design is Cooke Triplet and the Bokeh similar to the Trioplan 100mm f2.8, but with smaler bubbles.
Its predecessor was the Diaplan 80mm f2.8 (http://allphotolenses.com/lenses/item/c_4128.html) with all metal barrel. This later Pentacon has a plastic barrel.
Links to online resources: Posted by: Andreas Lindemann Date of publication: 10.05.2016
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