The next step is to look at the way the noise floor varies with ISO settings. I used 1/30 of a second for this test, made 16 exposures for each data point, and the results were surprising. Here’s the average value of the noise floor in the central 90% of the image vs ISO: And… [Read More]
Sony a7R noise floor
I am not completely happy with the preceding two posts. In order to do a better job of characterizing the vibration effects of the a7R’s shutter, I need to get further from the ‘scope, make the light path longer with mirrors (no smoke), or come up with a completely different way of making the measurement…. [Read More]
Sony a7R shutter vibration with 135 Telyt
I mounted a Leica 135mm f/3.4 APO Telyt on the a7R, mounted the camera on the tripod head with a generic RRS plate (RRS does not at present have custom plates for the a7 or a7R), and made an image (details in the preceding post). Here it is with as 6x expansion vertically and 2x… [Read More]
Sony a7R testing, part 1
[I’ve noticed that people are linking to this page a lot, since it is the first page of my a7R work. However, that work involves a lot of posts, so I’m adding a little roadmap. If you are more interested in the Sony alpha 7 (without the R), go here. If you want an overview… [Read More]
Long live limitations!
Over the Thanksgiving weekend, as usual, I played family photographer. While I’m aware that this is not art-making, I take it seriously, and do the best I can to produce 50 or 60 pleasing, emotionally-involving images, which I post on a private website a few days after the holiday. Since the stakes are low, I… [Read More]
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