Here now a side-a-side comparision with the Carl Zeiss Jena Sonnar electric f2.8/200mm
[if you are able to view crosseye stereo, it is very easy to see..].
Comparison GOI Telegoir (left) vs CZJ Sonnar 200mm (right):#1
#2
#3
#4
#5
I conclude the
Telegoir is copy of the Sonnar, very sharp already wide open (all tests were done at f2.8 ),
very creamy bokeh, excellent contrast and color (Telegoir is a little warmer), CA nearly as good as the
Sonnar (just a little more cyan OOF). Focal lengths are nearly identical. Both have 7-blade iris.
BUT - Weight: Telegoir 0.750 kilograms - Sonnar 1.130 kilograms (51% more).
Closest focus: Telegoir 1.5 meters - Sonnar 2.2 meters.
Carl Zeiss Sonnar 200mm is easy to find, GOI Telegoir is extremely rare, have only seen 3-4 in my life...