I would absolutely love to, but it is harder than I ever anticipated. I didn't think the len sizes of the barrel would be different so that threw a spanner in the works. What I need is a number of different cameras to test this on - and a few other things as well - before I can really even think about seriously selling, marketing or making a guide for this thing!

I just thought of something. I wonder if the white board plastic is in fact, just regular sheet plastic, something that dry erase markers would work on. That way, I could just try any white plastic. Going to experiment tonight and post.

a gear similiar to what dan uses would solve your diameter prob,, are you using these?

It would, but it would also be very very expensive. I think Dan was selling the set for about $500.00. I will probably make what I am doing variable sizes, like 6 different ones (measuring on lens I have) and ship them with the unit (if I ever get that far). The material I use are not aircraft aluminum, but they get the job done.