There have been recent reports of possible shutter-induced blur with tripod-mounted a7R/50mm lens combinations at speeds as fast as 1/160 second. I’ll be testing for this later, but I’d like to assure you that that hasn’t affected the aperture series that I’ve presented so far in this set of posts. Mindful of possible shutter-slap effects,… [Read More]
Archives for 2013
Coastal 60mm, Leica 50mm on a7R — right side
This continues an analysis of the Coastal Optical 60mm f/4 APO and the Leica 50mm f/1.4 Summilux ASPH on the Sony a7R. In the previous post we looked at the center. Now we examine the right side. Along the right side of the image, the Coastal Optical lens is a little low in contrast at… [Read More]
Coastal 60mm, Leica 50mm on a7R
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]
An irreproducible result
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]
Zeiss 35mm on a7R
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]
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