You may have noticed that I haven’t posted much for the last week or so. I’ve spent the time trying to come up with a way to measure the absolute and relative image sharpness of a7 and a7R when not firmly mounted to a tripod. I had been resisting this exercise in the past because… [Read More]
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Sony a7 shutter shock testing with the ISO 12233 target
In the last post, I went through the reasoning that made me decide that the Betterlight scanning back isn’t the right tool for the firehouse project. Thinking about a scanning back got me onto another way to get really high resolution: stitching. I figure for macro work, I’m not restricted to the usual “swing the… [Read More]
Looking back – and forward
I’m starting to take stock of the last couple of months’ work that I’ve done on this blog. In October and November, two things hit me at about the same time. They were interrelated and complementary, so I pursued both. The first was the challenge of making sharper pictures for the firehouse series. That led… [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]
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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