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Some QR plates have set screws that can be tightened down to reduce twisting. For example, you can see them in https://uniquephoto.azureedge.net/resources/uniquephoto/imag...

These positions line up with some locations on various medium and large format cameras (where there is a lot of weight in play).

1 comments

That's a pretty good idea, especially if the camera body has indentations that the set screw can really bite into. A second screw socket in the camera body would be better, though. It would be 100% backward compatible and solve the issue completely.

If you look at a Pentax 7 bottom plate, http://forum.mflenses.com/userpix/271_PENTAX67BOTTOM_1.jpg you can see that additional screw location. I am certain one of the holes in the hex plate matches it.

Good for Pentax for actually solving this issue. :)