After an extensive technical detour that will be familiar to regular readers, yesterday I started back on the Firehouse pictures. I took three cameras, the a7 (for handholding) the a7R, the D800E, and four lenses, the Zony 55 (on the a7), the Zeiss 135mm Apo Sonnar, the Zeiss 55mm Apo Distagon, and the Coastal Optics… [Read More]
a7 & a7R firmware upgrade
On Wednesday, Sony posted new firmware for the alpha 7 and the alpha 7R. The Internet immediately echoed with tales of bricked cameras. I waited a day, and upgraded both an a7 and an a7R with no troubles. I think all the upgrade sturm-und-drang was the result of an unforced error on Sony’s part. Most… [Read More]
Long exposure times with the a7R & Zeiss 55 Apo
I repeated yesterday’s tests with the Zeiss Otus. I mounted it to the camera with a Novoflex adapter. I mounted a RRS L-plate to the camera, clipped it in landscape orientation into an Arca Swiss C1 head which was attached to a set of RRS legs. No special lens-bracing hardware. I mounted a Singh-Ray variable… [Read More]
MTF details
A few posts ago, I started presenting MTF data in terms of cycles per picture height. instead of my previous units of cycles per pixel, which required the introduction of an explicit correction factor when comparing cameras of different resolution. This morning, I received a message from a reader containing an interesting question and a… [Read More]
a7R shutter shock at long exposures
I still want to use the Sony a7R for macro work. So today, I set out to discover how long the exposures have to be before shutter shock doesn’t matter. I mounted a Zeiss 135mm f/2 Apo Sonnar ZF.2 to the camera with a Novoflex adapter. I mounted a RRS L-plate to the camera, clipped… [Read More]
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