A few weeks back, I did a series of dark-field exposures with the Sony alpha 7S (a7S) at all available ISO settings. After some processing, I produced this graph: There are two places in the curve where sudden — and unexpected, at least by me — drops occur as the ISO is increased. The first… [Read More]
Getting ready for another exhibition
Today I’m taking a break from writing about camera testing to talk about actual photography. Those of you who came here for the tech talk: don’t worry; it’ll be back tomorrow. There’s going to be a ImageMakers-produced exhibition at the Museum of Monterey starting in early September, and running ’til January. That’s an unusually long run,… [Read More]
Mirror slap and shutter shock on the Nikon D810
There are rumors that the D810’s mirror and shutter motions are less damaging to image sharpness than those of the D800. I thought it was worth running a test. I put a Sigma 50mm f/1.4 DG on a D810, the camera in landscape orientation to an Arca Swiss Cube with a RRS L-bracket, and mounted the head… [Read More]
Nikon D810 summary
I’m about done with my Nikon D810 testing. I may do one or two little things, but it’s time for some conclusions. From a noise perspective, the sensor in the D810 is a modest step up from the D800E’s if you operate at base ISO. There are some games being played at the higher ISOs that show… [Read More]
D810 sharpness and aliasing
The Nikon D810 has no anti-aliasing (AA) filter. The D800E has a tricky now-you-see-it-now-you-don’t (non-AA?) filter. Is there any difference in the sharpness of the two cameras? How about aliasing and sensitivity to moire? I mounted a Sigma 50mm f/1.4 FG lens on the 810. I set up an ISO 12233 target. so that the… [Read More]
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