While waiting for the diffuser to arrive for testing the Adobe Flat Field workflow, I decided to take a peek at corner smearing. I took the lens that had given me a lot of trouble with corner color casts, the Zeiss Biogon 35mm f/2, mounted it on the a7R, went outside and made this picture,… [Read More]
Sony a7R — taking stock
Upon thinking about it, I find yesterday’s corner color cast results with the M-mount lenses on the a7R pretty depressing. We’ve already seen that lenses long enough to require a lens collar – or even, I suspect, mounting to the tripod via a plate on the adapter — have a problem on the a7R because… [Read More]
Sony a7R corner casts with flat fields
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]
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]
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