lol, you guys.
Darcy, I have a very, very sturdy tripod with a big head (shush, Troy!).
It really doesn't take all that much of a push back against the lens.And, in actuality, what I'm doing is sitting the filter flush upagainst the lens just prior to taking the exposure. One of my filtershas curved slightly from sitting in my bag pushed upa gainst otherequpiment, and, even then, I still don't rock the camera when exposing.
You just have to be gentle. If you have a solid tripod with a solidhead, dithering the filter across the front of the lens will/should belike brushing a tissue past the lens. It shouldn't move at all.
Give it a go!
H