[I’ve noticed that people are linking to this page a lot, since it is the first page of my a7R work. However, that work involves a lot of posts, so I’m adding a little roadmap. If you are more interested in the Sony alpha 7 (without the R), go here. If you want an overview… [Read More]
Long live limitations!
Over the Thanksgiving weekend, as usual, I played family photographer. While I’m aware that this is not art-making, I take it seriously, and do the best I can to produce 50 or 60 pleasing, emotionally-involving images, which I post on a private website a few days after the holiday. Since the stakes are low, I… [Read More]
Sharpness testing, part 20
Armed with the peak-to-peak (PP) amplitude and frequency of the mirror-slap initial vibration, we can calculate the shutter speed necessary to hold the vibration-induced blur to under 1 pixel. Consider the image from the preceding post, for a Nikon D800E and a Nikon 400mm f/2.8 lens, as an example. The PP amplitude was 18 pixels… [Read More]
Sharpness testing, part 19
I performed a test of the D800E and the Nikon 400mm f/2.8 lens with the oscillocope time base set to 1/2 second per division. Here is the result magnified by a factor of 6 in the vertical dimension: Same second-order underdamped vibration. The time constant seems to be even longer than two seconds, more like… [Read More]
Sharpness testing, part 18
This is getting a little far afield from my original reason for doing the testing, but yesterday’s mirror slap results got me interested in two things: Did the D4 work the same way as the D800E? How long did it take the mirror slap vibration to decay? I put the D4 on the 400mm f/2.8… [Read More]
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