Seacam housing “claw” modification for Canon 1D Mark IV
Stephen Frink has posted photos of an official Seacam modification that allows for full control of Canon 1D Mark IV SLRs in Seacam 1D Mark III housings. Seacam are calling it the “claw” modification—a simple replacement part that allows for access to the FEL button, the button the 1D4 uses to immediately start recording a video. This particular modification removes access to the ISO button, but ISO access can easily be moved to another control via custom function.
Seacam will also retrofit existing housings for FEL / 1D Mark IV support, but this is probably the cheapest way to get FEL button access in a Seacam housing.