Yashica Yashinon-R 1:5.8/90~190mm

I bought this to satisfy a developing curiosity about Yashinon lenses.  I found this lens to be typical of consumer-level zoom lenses of the period.  The image quality is fair, suffering from edge sharpness problems.

The lens itself is very basic and using it at various focal-lengths is easier than changing lenses but not as convenient as modern zooms.