25mm F1.4 CCTV Lens for C Mount Cameras & 16mm C Mount to Micro Four Thirds Adapter - Professional Video & Photography for Filmmaking, Surveillance, and Vlogging

Overall I am pleased and would recommend this lens.I put this lens on my Sony A7iii, Canon 80d, and Panasonic GH4.The image circle this 25mm lens produces will fit a M43 sensor without vignetting.Some dark vignetting on APSC, and you can see the entire image circle in blackness on Full Frame.I like the creative look on FF. Very interesting to play with.The one big negative imo is that the focus ring is on the back of the lens, where as on most lenses it is on the front. This makes it unpleasant, but not too difficult, to focus as the ring is literally right up against the camera body.Not a huge deal tho considering.Excellent sharpness.Impressively mild Chromatic AbberationAccurate color rendition, not too warm or cold.Good Smooth BokehOut of focus regions do not appear too busy imo.No intense onion rings, pretty smooth. Impressive for so cheap.When stopped down bokeh takes on a pentagon shape.It has a non linear focal plane. (idk if that's the proper term.)The focal plane is spherical so the center will be in focus and the edges will be out of focus, and vice versa.Certainly helps with subject separation if subject is in center.Cool mild swirly effect when subject is center frame and in focus.The out of focus regions around the subject have this mild swirly effect. Very cool. To be honest I wish it were more pronounced.