Canon 20Da Firmware on a 20D won't work
I was just wondering if the live focus feature in the Canon 20Da is a hardware change like the different IR filter is or if is purely software... you would think it would be software. You can download the 20Da firmware but it appears to be in Japanese.
UPDATE
It won't work because the mirror on the 20Da is semitransparent, allowing simultaneous viewing through the eyepiece and the LCD.