Kiev rangefinder
Unmetered models
They are all derivatives of the Zeiss Ikon Contax II.
The Kiev 2 (or Kiev II) is a clone of the pre-war Contax II.
The Kiev 2a is a Kiev 2 with flash sync added.
The Kiev 4a is a Kiev 2a without the stabilizing foot. Later models have top speed of 1/1000 s instead of 1/1250 s.
The Kiev 4am has a fixed take-up spool and a rewind lever.
Metered models
They are all derivatives of the Zeiss Ikon Contax III.
The Kiev 3 (or Kiev III) is a clone of the pre-war Contax III. It has an uncoupled selenium meter.
The Kiev 3a is a Kiev 3 with flash sync added.
The Kiev 4 is a 3a without the stabilizing foot, and with some cosmetic styling changes influenced by the Contax IIIa. Later samples have top speed of 1/1000 s instead of 1/1250 s.
The Kiev 5
The Kiev 5 is a pure Soviet design. The lens mount does not have the inner bayonet and it has a film advance lever.