To satisfy myself, I performed a test with my a7R and several lenses. I taped 2 US bank notes to a foam-core board, and taped that to the wall. I illuminated the notes with an incandescent 100 watt soft white bulb from the left.
From a distance of 5-7 feet (depending on lens), I mounted a Tamron 90mm f/2.8 macro (alpha mount), and Sony 70-200mm f/2.8 G (at 200mm) to the Sony IL-EA3 adapter.
I used a Desmond L Plate DAL-1 universal arca compatible plate on the adapter to secure the camera on a RRS BH-55 with pro (screw) clamp, which was installed on a Gitzo 3541LS, with 3 leg sections extended.
I used the Sony RM-VPR1 Remote Control to actuate the shutter.
I shot the 70-200 mounted both with the lens collar, and using the L plate on the adapter.
I shot the images at f4, and using shutter speeds from 1/250s to 1/30s, at 1/3s intervals. The images were shot in raw, and processed in LR 5.3 (final). I cropped the center of the images to a 4x5 aspect ratio, equalized the white balance and exposure, but used no sharpening.
Cutting to the chase, I see little evidence of shutter induced vibration at any shutter speed.
a7r Sony 70-200G at 200mm f/4 1/250s (using lens collar)
a7r Sony 70-200G at 200mm f/4 1/80s (using lens collar)
Complete set of 70-200G at 200mm f/4 (using lens collar)
Zenfolio | Graham Best | a7r 70-200 collar
Complete set of 70-200G at 200mm f/4 (using adapter L plate)
Zenfolio | Graham Best | a7r test
Complete set of Tamron 90mm macro f/4
Zenfolio | Graham Best | a7r Tamron 90 marcro test