Back in the late 1990s as the digital revolution overtook photography there were abortive attempts to develop a digital upgrade for 35mm film cameras. Imagine a film cartridge with attached sensor ...

At 15mm, central sharpness is outstanding at f/2.8 and f/4, excellent from f/5.6 to f/16 and very good at f/22. The edges are very good at f/2.8, excellent from f/4 to f8, very good at f/11 and f ...