Bob - I could do what you suggest, but then I'd love that slide holder that can be locked in place and I'd be back to taping my sides to the window to copy them.
Dave - I never thought about the crop factor, right now I'd be happy to get anything close to the right size in focus!
In order to mount the camera, I am using more extension than needed to get 1:1. So, what I am trying to figure out is how to get less magnification from that amount of extension. Wider lens, longer lens, greater working distance from the front of the lens to the slide?
Just having one of those days where my mind is running in circles and not getting anywhere.