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]
Archives for 2014
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]
Shutter slap simulation with ISO 12233, part 1
I can’t measure sub-pixel camera movement at the sensor, so I have to look for indirect ways to get at it. Are there ways to glean such information from photographs of the ISO 12233 target? I turned to a simulation study to find out. Using Matlab, I created a nearly-ideal camera with a resolution of… [Read More]
a7R and D800E shutter slap testing with ISO 12233
I’m looking for a way to do shutter slap testing with sub-pixel sensitivity without spending a lot of money on variable intensity LED Fresnel lights. It occurred to me that I might be able to get what I need using neutral density filters to compensate exposures for different shutter speeds. Before I get started with… [Read More]
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