The vibration issues with the a7R’s shutter have caused me to spend more time thinking about how to test for shutter-induced vibration. The same techniques can be used to test for mirror-slap vibration in SLRs, but that’s not usually too much of an issue, for two reasons: mirror-slap vibration is larger, and therefore easier to… [Read More]
Leica WATE on the Sony a7R — crops
This post has the 1:1 crops from the Leica WATE on the Sony a7R images referenced in the preceding post. Center, 16 mm, f/4: Center, 16 mm, f/8: Center, 18 mm, f/4: Center, 18 mm, f/8: Center, 21 mm, f/4: Center, 21 mm, f/8: Upper left, 16 mm, f/4: Upper left, 16 mm, f/8: Upper… [Read More]
Leica WATE on the Sony a7R
There’s been some interest in how the Leica 16/18/21 Tri Elmar ASPH — aka the WATE, for Wide Angle Tri-Elmar — performs on the Sony a7R. Because it is designed with its exit pupil quite a ways from the sensor plane, there is reason to suspect that it should work well on the a7R. The… [Read More]
Controlling for shutter slap
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]
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]
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