The Really Right Stuff L-bracket for the Sony alpha 7R arrived yesterday. You can order just the bottom plate. You can order just the vertical bracket, though you can’t do anything useful with it unless you have the bottom plate. Or you can order the pair together, and save a few bucks over buying them separately.
The bottom plate is really well designed. It makes good contact all the way around the camera’s base, once the camera is modified slightly. I’m indebted to Joe Holmes for this suggestion: peel off the UL-approved label on the bottom of the US-version of the camera, and remove any remaining adhesive (you can use a solvent, but I just used my thumbnail) before attaching the bottom plate. Now you’ve got better contact between the plate and the camera.
The bottom plate mounts with a ¼ inch screw that goes into the tripod hole on the bottom of the camera. Like they did with the M240 plate, RRS supplies a screw with a fold-down loop so you can tighten it without using tools. I don’t recommend this. Instead, take the supplied Allen wrench, and get the screw reasonably tight. You won’t be able to remove it without tools, but, unlike the M240, you won’t need to; the battery compartment is easily accessible through an opening in the bottom plate, and the SD card door is not interfered with at all.
Before you mount the bottom plate, you’ll have to decide whether or not you want to use the vertical bracket, since the same screw that attached the bottom plate holds the vertical piece into position. I’m not as impressed with the vertical attachment as I am with the bottom plate. The biggest problem I see is that it doesn’t contact the side of the camera at all; it’s cantilevered off the bottom plate. This means that there’s a vibration mode possible where the corner of the vertical part acts like a leaf spring. Whether or not my theoretical objection to this design is warranted will require testing, and that testing will be made more difficult since, as we’ve seen in earlier testing, the camera almost always vibrates more in portrait than in landscape mode.
Anyway, it looks a lot more effective and convenient than the generic plate I have been using.