Thanks for you replies. Another question, does the 7D output HDMI at full 1080 resolution?
I would like use it as a B-camera with the EX-1, and the HD switcher for live events...Because I already have and HDMI to SDI converter.

it outputs 1080 but it will have the red rec dot on the upper right corner.

Honestly I got nothing but soft grainy images with the letus extreme + the EX1. It was acceptable back then but I was never 100% happy and I tried pretty much all the adapters out there. Since I have my 7D I sold the letus and never looked back. I think I will never use a 35mm adapter again. Light loss, GG grain, batteries, turn it on, size and weight, image quality, the list goes on and on. If I need shallow dof I shoot 7D, otherwise I shoot EX1. Just my opinion.

Does it output full 1080 also while recording? Is it possible to remove the red dot with magic lantern?

We will hopefully know soon!

Having had a Letus and then purchasing a 7D, it was very simple for me to stop using the Letus. I agree with all the reasons mentioned previously. The only disadvantage is the dog and pony show that a Letus gives to an A1.

Chad

I love my letus elite/ex1, when filming at work, I use it for all my interviews and I use my 7d for catching gv's etc.
Something nice to be said about footage from adapters.
This makes a nice combo.....and sharp too.