Today we’re back to simulated images of the ISO 12233 target. Here are the camera parameters: Perfect lens 64-bit floating point resolution Target resolution: 10000×6667 pixels Target size in camera pixels: 1500×1000 No photon noise No read noise No pixel response non-uniformity 100% fill factor No focus error Bayer pattern color filter array: RGGB No… [Read More]
Archives for January 2014
Shutter slap testing with ISO 12233, part 4
The Sony a7R/55mm Sonnar testing with strobe illumination of the ISO 12233 target performed in the previous post got me worried. If the Sony’s shutter affects the sharpness of strobe-lit subjects with a normal focal length lens, would Nikon D800E mirror slap suffer the same fate? I mounted an AF-S 58mm f/1.4G lens on the… [Read More]
Shutter slap testing with ISO 12233, part 3
One of the unanswered questions from yesterday’s post was, “What degradation does the variable ND filter do to the image?” Today I set out to get a handle on that. I went into a dark room and lit a smaller version of the ISO 12233 target with two Paul Buff White Lightning X1600 (1600 watt-second)… [Read More]
Shutter slap testing with ISO 12233, part 2
Let’s take a break from the simulations to look at some real pictures. I got a 77mm Heliopan ND 0.3 to ND 1.8 variable neutral density filter and some adapter rings. I screwed the 49/77mm ring onto the Sony/Zeiss 55mm f/1.8 Sonnar FE and aimed it at the ISO 12233 target, which ended up being… [Read More]
Shutter slap simulation with ISO 12233, part 2
I’ve done some more work with my camera simulator. I decided that doing the antialiasing filtering by allowing fill factors of greater than 100%, while programmatically convenient, is not always a good approximation to real AA filters. So I’ve added a separate AA operation that uses either rectangular averaging (box) filtering or circular averaging (pillbox)… [Read More]
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