> This lens has excellent sharpness & contrast. Bokeh pretty good too. It has some pincushion distortion. It is nicely made and has a smooth solid feel. The lenshood intrudes into the bottom L hand corner of the > finder. The lens cap comes off too easily; I kept dropping mine until it fell just right onto a hard bit of paving and acquired a slight dent on the rim that makes in clip into place with a solid click and stay in > place.I use it on an M4 with a bayonet adapter.
I've owned a Ricoh 28mm for one month two years ago. I did not satisfy with this lens because the contrast too high and the color satuation is not up to my requirement. It is an expensive lens, and I prefer the lastest version of Elmarit 28/2.8 or Minolta CLE 28/2.8. Recently, I found the Cosina Voigtlander Skopar 28/2.8 and Ultron 28/1.9 are producing better performance than Ricoh. This two Japanese Voigtlander 28mm lens reqire half to 60% price of Ricoh.