At 15mm, central sharpness is outstanding at f/2.8 and f/4, excellent from f/5.6 to f/16 ... f/2.8 to f/11 and very good at f/16 and f/22. At 35mm, central sharpness is excellent from f/2.8 ...
There's no manual aperture ring like many modern lenses, which would be a useful feature for videographers if present. Many ...