Is an electronic flash fast enough to stop the a7R shutter slap motion? It depends: All equipment the same as the last post unless noted. Camera shutter release mode: 2 second self-timer, shutter speed: 1/160 second, first curtain synch: 90mm Leica f/2 APO Summicron, f/5.6 with ND filter at minimum absorption, flash duration 1/8000 second… [Read More]
Archives for January 2014
Shutter slap testing with ISO 12233, part 10
A “to do” from some time ago was to verify that the Heliopan ND filter that I’m using for the shutter series testing does not itself introduce unsharpness that would invalidate the conclusions that I’ve been drawing in the previous posts. I’ve been waiting on a flash with shorter duration than my White Lightning X1600s,… [Read More]
Shutter slap testing with ISO 12233, part 9
I made another series of images like the one in the previous post, but with a different head: I swapped the RRS BH-55 for an Arca Swiss C1 Cube. Everything else was the same: Leica 135mm f/3.4 APO-Telyt on the A7R with a Novoflex adapter, generic RRS plate on the bottom of the camera, and… [Read More]
RRS L-bracket for the Sony a7R
The Really Right Stuff L-bracket for the Sony alpha 7R arrived yesterday. You can order just the bottom plate. You can order just the vertical bracket, though you can’t do anything useful with it unless you have the bottom plate. Or you can order the pair together, and save a few bucks over buying them… [Read More]
Demystifying the Sony a7R shutter operation
It’s been clear to anyone testing the Sony alpha 7R that its shutter is a different animal from what DSLR shooters are used to. I’ve been reporting on what that shutter does to pictures of test targets, of oscilloscopes, and of real subject matter. But what do I know about what goes on inside the… [Read More]