Archives for 2014

Let’s take a break from the technical minutia and spend at least one post on a photographic issue that’s important – or should be important – no matter what you think of the a7R’s shutter. Brooks Jensen just posted a rumination on photographic quality. Rather than summarize Brooks’ post, I suggest you read it –… [Read More]

Ferrell McCullough proposed an idea a couple of days ago that sounded better and better the more I thought about it. Why not do some testing of the strobe-lit images with rear-curtain synch at various shutter speeds? We could then see blur that was big enough to show up during the strobe duration at discrete… [Read More]

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]

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]

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]