@Bob at the moment I've got the centerline of the camera about 6 inches off the table. However, it could be more than that. This will be something semi-permanent for the next several months but I'd rather not damage or mar the lens if I can avoid it. Something that I could take in- and out easily would be great so long as it will return to the exact spot. I'm thinking about machining something to mate to the filter threads if no other idea presents itself (with cushioning supports for the rest of the lens and body).