cunim
Well-known member
Now this brings back memories. The A7r displays shutter-induced vibration like any similar camera. This issue is obvious if you are looking for it - but it would be with any other camera with an fp shutter. Given there is no mirror lockup, solution is not to look for it or use appropriate exposure discipline. Perfectly standard stuff.
The more serious problem is that the A7r also has a resonance mode that is easily excited. When it happens the results are bad enough to ruin those images. Mounting and FL have little to do with it - at least in my hands. For example, the gross vibration happens a lot with a Summicron 50 or 90 at exposures between about 1/10 and 2 x FL. Putting the camera on a massive studio stand vs a light carbon tripod makes no difference. Hand holding may even help. Worst case is mounting the camera to a rigid and light set of steel legs. That whole system can form a resonant circuit. The images are trash.
In contrast, the Sony FE55 is very well behaved. With that lens I have only seen normal fp shutter effects.
The more serious problem is that the A7r also has a resonance mode that is easily excited. When it happens the results are bad enough to ruin those images. Mounting and FL have little to do with it - at least in my hands. For example, the gross vibration happens a lot with a Summicron 50 or 90 at exposures between about 1/10 and 2 x FL. Putting the camera on a massive studio stand vs a light carbon tripod makes no difference. Hand holding may even help. Worst case is mounting the camera to a rigid and light set of steel legs. That whole system can form a resonant circuit. The images are trash.
In contrast, the Sony FE55 is very well behaved. With that lens I have only seen normal fp shutter effects.