Originally Posted by oftheherd
But the Yashinons were a very good line that just didn't get their due in their day. Something like the Fujicas that some fool on these forums keeps touting.
The same is true for almost all of the non-major brand lenses and cameras. Rikenon and Mamiya-Sekor lenses were generally of very good quality and even Chinon and Cosinon lenses were of much better optical quality than the (mostly undeserved) iffy reputation of their brands would suggest. The major brands were significantly better generally only in "special lenses" such as very fast lenses, long teles, super wide angles and of course zooms.
Yet, I am still surprised how good my "Sun" f/4 constant aperture 70-210 mm zoom for the M42 actually is. It is from late 1970s but does not have multi-coating. Other than that little shortcoming (it does have integral shade) it provides quite respectable sharpness at all focal lengths. Contrast could be better, but I would not call it "poor" by any means.