This Cambo recessed lensboard is for 90mm or shorter focal length lenses. It places the lens closer to the film plane, while allowing the front standard to remain further away and capable of more image control movements. With pilot hole. For all Cambo and Calumet 4x5 and 8x10 cameras (except 23SF). Calumet will drill the Copal shutter sizes for an additional $10 charge.