There have been recent reports of possible shutter-induced blur with tripod-mounted a7R/50mm lens combinations at speeds as fast as 1/160 second. I’ll be testing for this later, but I’d like to assure you that that hasn’t affected the aperture series that I’ve presented so far in this set of posts.
Mindful of possible shutter-slap effects, my practice in this review has been to start a four-stop series at 1/4000 second for the widest aperture, which means that the smallest aperture will get 1/500. For a five-stop or longer series, I start at 1/8000.
I also use the self-timer to trip the shutter, which seems a little silly, but you can’t be too careful.
I did some shutter vibration tests using the iseismometer app on the A7R. I compared the A7R, D3 and NEX-7. The output is sensitive in XYZ axes.
Thank you for all your testing, excellent work you’re doing!
http://beforethecoffee.com/sony-a7r-vibration-comparison-with-nikon-d3-and-sony-nex-7/
Ferrell, you’ve done some great work here. As it turns out, your comment reached me after I had written a set of musings on shutter slap testing today. I’ll think about what you’ve done, possibly modify it based on your insights, and post it tomorrow.
Jim