Additional information:
The Meyer-Optik Görlitz Diaplan 80mm f2.8 is projection lens for 35mm Slide Projectors.
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 smaller bubbles.
The first version of this lens was the Diaplan in all metal. The later Pentacon AV has a plastic barrel.
Links to online resources: Posted by: Andreas Lindemann Date of publication: 08.05.2016
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