The Zacuto Z-Finder Mounting Frame for DSLRs with Battery Grips is required when mounting a Z-Finder to the 3" LCD screens of small-body cameras--from the Canon 5D Mark II to the Nikon D90--equipped with battery grips. This longer frame attaches to a required Gorilla Plate using two thumb screws; then, with the frame's rubber edges pressing snugly against the LCD screen, the Z-Finder can snap quickly into the frame and be just as easily removed.
For small-body DSLRs with 3" LCD screens, including:
Canon 5D Mark II
Canon 550D (T2i)