Mike, how are you attaching the E1 to your RRS plate? I've got the plate for my 5D (and soon for my 40D), and am curious.
I just checked the RRS site for the 5D plate and it also has the lug where you can attach the bottom end of the E1 strap:
http://reallyrightstuff.com …emdesc.asp?ic=B5D&eq=&Tp=![]()
The strap just loops through that lug, just like the 40D plate.

