Ricoh GR Lens review: High imaging performance at a more accessible priceBy Kevin Carter - Tuesday June 11 2013 Lens Review
One point difference in the DxOMark scores between the GR lens and 18.5mm f/2.8 Nikkor lens on the Coolpix A means they are in are in fact very evenly matched. The lens and sensor configuration is similarly efficient resulting in the same excellent 13P-Mpix sharpness score, and they both share consistent edge-to-edge sharpness, however, the main difference between the two is in their vignetting.
In the extreme corners the Ricoh is brighter, approximately 1 EV at full aperture dropping to +2/3EV from f/4 through to f/16. In today’s digital world, however, vignetting isn’t as much as a problem as it was in the days of film.