Quote Originally Posted by Michael Finder View Post
I have had success using the Quickdisc. Pretty simple to use, fast, and no calculations required.
It's here at: http://www.salzgeber.at/disc/index.html and it's FREE.
Cheers Michael.
I echo this, works like a charm..before that I had a metal tapeline which I used to measure the bellows extension with small colored stickers for each lens I used and the subsequent correction factors to be applied after extension in the colors matching the lens...

Best,

Cor