I am not completely happy with the preceding two posts. In order to do a better job of characterizing the vibration effects of the a7R’s shutter, I need to get further from the ‘scope, make the light path longer with mirrors (no smoke), or come up with a completely different way of making the measurement…. [Read More]
Archives for 2013
Sony a7R shutter vibration with 135 Telyt
I mounted a Leica 135mm f/3.4 APO Telyt on the a7R, mounted the camera on the tripod head with a generic RRS plate (RRS does not at present have custom plates for the a7 or a7R), and made an image (details in the preceding post). Here it is with as 6x expansion vertically and 2x… [Read More]
Sony a7R testing, part 1
[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]
- « Previous Page
- 1
- …
- 8
- 9
- 10
- 11
- 12
- …
- 40
- Next Page »