- Posts: 156
- Joined: Wed Dec 05, 2012 7:06 am
Get some coffee/tea and read the whitepaper:
http://www.metabones.com/images/metabones/Speed%20Booster%20White%20Paper.pdf
The Speed Booster needs some space to do its optical tricks that takes up flange distance, so you can't do an EF to EF.
Jules