This is a preset manual lens, with continuous aperture, which can be limited with a special preset ring. It has 15 blades which close and open very smoothly in the range F4-F22. The focus throw is very large. Removable mount - M42 or exacta.
The Meyer version is the classic "zebra". The Pentacons are also listed
here, and come in several styles, pic 3 shows one also with removable mount, later ones are fixed mount, 6 blade iris (needs separate review page).
5 elements in 5 groups.
Weight 600g.
Filter size: 58mm.
Normally comes with small screw on hood.
The mounts on these are removable, typically M42 (most common) or Exacta.
FoV = 12°.
For those of you unfamiliar with the preset aperture mechanisms, "Mr Pentacon Six" has made these Utube videos:
method 1;
method 2.
This thread on stopping light leaks with narrow profile M42 lenses that don't cover the camera mount may be useful.
Min. focus distance 2.5m (in practice more like 2.2m).
Made in DDR - the post war pre-unification East Germany.
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