Do you see any real use for the lens on the G1?
Thank you for your comments, Jonas. At least mine is quite sharp fully open. Add some software sharpening in postprocessing and it will shine. QC was and is not the strong point of Russian (in this case Ukrainian) industry, there might be relevant differences from one lens to another.
I like the lens a lot on the G1. With the kit lens it is not easy to set the plane of sharpness where you want it. With a manual lens such as the Zenitar you can focus on what you want to be sharp and have the background or foreground out of focus ("bokeh") by playing with the aperture. See for instance the fourth and fifth picture of my series.
While bigger than a c-mount lens of the same focal length, it is not very heavy and easily portable; it covers the full sensor area without vignetting or smearing.
On the G1 the outer region with the typical fish-eye effect does not reach the sensor and it behaves very much like a normal wide angle; the barrel distortion that would be distracting on FF 35mm is seldom disturbing on 4/3rd.
Kind regards
Peter