In the last post, I promised pictures. Here goes. But before you look, a few words about what you’re seeing. These are all examples of wide f-stop images — f/4 for the f/4 and f/3.8 lenses, and f/2.8 for the others. Wide openings show falloff and corner color shifts at their worst. They’re also photographs… [Read More]
Archives for 2013
Sony a7R corner cast graphs
When I tested the NEX-7 with M-Mount lenses, I noticed a lot of color shifts in the corners with some lenses. All else being equal, the errors seemed to get worse the closer the exit pupil of the lens was to the sensor, and the wider the aperture. M-mount lenses, being made for a body… [Read More]
Sony a7R DRO
There is a setting on the a7R called DRO. It stands for Dynamic Range Optimization, I think, and it is on by default. That sounds like something that could produce the weird effects that I’m seeing. Here is the entirety of what the manual says about it. Using the [DRO/Auto HDR] function, you can capture… [Read More]
Sony a7R SNR testing analmoly
There is an odd discrepancy between the SNR data for he D800E and the a7R. Here’s the low-midtone SNR vs ISO setting for the a7R, from a few posts back: Here’s the same graph for the D800E: Notice that the D800 SNR’s are a little over a half a stop worse than the a7R ones?… [Read More]
Sony a7R post-push closeups
I zoomed in even further on the images from the preceding post, and doubled the size in both directions using nearest neighbor, so that single pixels become 2×2 blocks. ISO 100: ISO 200: ISO 400: ISO 800: ISO 1600: ISO 3200: If I get picky, I can say that the noise in the ISO 100… [Read More]
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