FED 1:2 F=50mm is a fairly rare lens from the 40s of the last century. Produced as standard for cameras FED-S (FED-Komandirsky, FED-NKVD), it is relatively well known that about 20000 lenses with cameras have been produced.
The lens is made in a retractable design, however, despite the fact that it can be installed on cameras through the M39 adapter, there will be no infinity by default. You need to move the lens a little closer to the matrix for it to appear. Non-standard working length, that's all. For shooting portraits of a regular position after installation, it’s quite enough for yourself. And at infinity, I'll tell you - there is sharpness). Simply keeping the FED tube 1:2 F=50mm not fixed in its place on a permanent basis is fraught with a punched matrix. The tube in the folded state will confidently reach it.
FED 1:2 F=50mm is interesting not only because it is, in essence, a copy Leitz Summar 2/50 in a simplified frame, but also because it is a lens that does not have any enlightenment at all from the factory. A natural oxide film coating appears on the front lens after a while, but this can be neglected, since the picture will improve only when shooting in b/w. Small. At all. In general, I cleaned this film of patina, along with dirt and dust with lenspen, so that at least I could shoot. In the photograph of the lens, it seems that without enlightenment it looks somehow lifeless. After all, its glass does not really shimmer, and does not have any deep coloring.
FED 1:2 F=50mm has a convex front lens. The rear lens is also convex. Depth of field, perhaps that's why it's the same). The lens circuit has 6 elements in 4 groups. The scheme is identical to the Leitz Summar 2/50, produced by the Germans from 1933 to 1940. The difference is not only in the simplified frame, but also in the number of petals. The 6-blade Leitz diaphragm produces a hexagonal hole, while the 10-blade 2/50 FED produces a round hole at all apertures.
The FED diaphragm 1:2 F=50mm is controlled by a ring that goes immediately behind the frame of the front lens. The ring is threaded and critical to the presence of lubrication due to the fine thread pitch. The set of values \u2b\uXNUMXbis not quite familiar - XNUMX, 2.6, 3.5, 4.5, 6.3, 9, 12.5, 18... The rotation of the ring will be smooth and easy if it is properly maintained.
Focus control is similar to the Industar-22 3,5/50 and FED 3,5/50 tube lenses. You drag the ledge with the blocking button in a circle, thereby aiming. Tube FED 1:2 F=50mm is longer and thicker than its more massive and dark counterparts.
The lens has sharpness. Center. Closer to the edge of the frame, it decreases significantly. Of course, I don’t know how things are with the sharpness of older planars for large format, but the Sony A7 II, with focus peaking turned on, draws sharpness like a buzz, and with FED 1: 2 F = 50mm zoom must be used for precise focusing.
The lack of contrast can somehow still be leveled out during post-processing, but the huge number of re-reflections that occur when light sources enter the frame - alas, no.
There is a review of several lenses from FED, and cameras of a later release:
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