The Kiron 70-150 is sharp, contrasty and unusually well dampened for a one touch zoom It is sharp at f4 with a pleasant bokeh. There is minor zoom creep on my lens. It can be an issue when shooting macro at a steep angle. It has excellent full time 1:4 macro performance.

It does suffer from noticeable fringing in high contrast scenes but if you avoid a stark white sky you will be very happy with the results. It is relatively small so it will handle well on a mirrorless body. It handles very well slr bodies. Focusing is easy and it balances very well. I have never had an issue with camera shake while using the Kiron 70-150. This is one of my faviorite lenses. It's build and image quality are very high for a lens that regularly sells for less than $50.
f4 - close focus