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]
Archives for 2014
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]
Shutter slap testing with ISO 12233, part 8
Early on in my testing of the Sony a7R, I ventured the opinion that the camera probably wouldn’t exhibit image degradation from shutter slap with lenses of 135mm or shorter focal length with the camera in landscape orientation with the camera mounted directly to a tripod head (no lens collar). Then I found image degradation… [Read More]
The effect of vibration blur on resolution
Lloyd Chambers has asserted that a 1/5 pixel blur on a 36 megapixel camera turns it into an instrument with the resolving power of a 24 megapixel one. The logic is superficially appealing: the pixel pitch of a full frame 36 megapixel camera is 4.88 micrometers; multiply that by 1.2 and you get 5.86 um,… [Read More]
Shutter slap testing with ISO 12233, part 7
In yesterday’s post, I used photographs of an oscilloscope screen to conclude that the Sony a7R/Zeiss 100mm f/2 Makro-Planar ZF/Novoflex F to E mount adapter/Novoflex adapter collar/Arca Swiss Monoball/Gitzo GT3541XLS combination produced 2 or 3 camera pixels peak-to-peak vibration with the camera oriented in portrait position. The day before yesterday, I performed testing of the… [Read More]