You are absolutely correct!
The "I" models (I, Ia, Ib and ICS) have a 1:1 finder, but no rangefinder patch. All others have 1:1 finder and coupled rangefinder.
All "a" models show the metering in the finder AND outside. The I and II (without a)outside only.
The b and CS models show the metering in the finder only.
All Ultron Versions have a total lens focusing.
The I, II, Ia IIa with ColorSkopar have also full lens focusing.
The Ib, IIb (with Color Skopar) have front element focusing only.
All IIIb and IIICS have Ultrons. All Ib IIb ICS IICS have Color Skopar lenses.
The IIa mostly have Color Skopar lenses, but some were made with Ultrons on special order, too.
The b and CS models show the shutter-time combination in the finder, too. Not sure about the other models.
The rarest is the IIICS, only 4200 were made.
Maybe the IIa with Ultron is also rare, I have no numbers for this camera.
The rarest is the
Last edited by errorlogin : 11-20-2011 at 08:10.