The FED-4 was produced in two versions.

This first version FED-4a with wind knob and lower viewfinder

was modified from FED-3a to accept a light meter.

The light meter control knob is where the rewind knob was

so the rewind knob now sticks out of the side.

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Name: „ФЭД FED 4“

Producer: FED
Frame size: 24x36
Lens: Industar-61 panda
Shutter: 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500 and B

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Quantity: 633.096 units (all types 4a and 4b according to sovietcams.com)

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Photos 5, 6: FED 4a #4012977 and I-61 #081136 (Panda)