The thing I notice about scissor jacks though is that the elevation per turn of the knob seems to vary depending on the position of the scissors. As Rik says, though you can use a jack to roughly position the subject, you need some form of fine adjustment to move the camera or subject if you are wor...

George You could use the scissor type of Lab Jack for vertical lift, but the adjustment is a bit coarse:- http://www.labdepotinc.com/Category_Details~id~334.aspx I did not realise how expensive these were though because I had mine given to me! Another alternative is to use a vertical set-up using a...