I tested the Coastal Optical 60mm F/4 APO and the Leica 50mm f/1.4 Summilux APSH on the Sony a7R. These are both truly impressive lenses, and in the Leica barely edges out the Coastal Optical lens in the center. However, in the corners, the a7R smears the Summilux images, and it’s no contest. The scene,… [Read More]

There’s been speculation on some of the photo boards that the Leica M240 color may have something to do with a thin, and therefore not particularly effective, IR filter. The thin filter is desirable to avoid sharpness difficulties at the corners of cameras where the back end of the lens is close to the sensor… [Read More]

In this post, I’d like to look at center and edge sharpness of the Zeiss Biogon ZM 35mm f/2. I’ll use the corrected images from the preceding post, but it really doesn’t make much difference. Spoiler: the center is bitingly sharp, but you don’t have to go to the corner to see smearing. Center at… [Read More]

A while back in the a7R testing, I said I’d ordered a diffuser and would test the Adobe Flat Field interleaved workflow when it arrived. The expodisc came yesterday, so here goes. To review the bidding, Adobe Flat Field (let’s call it AFF) is a beta plug-in for Lightroom. The purpose of the program is… [Read More]