The O’Connor O-Box is the most rugged matte box we carry. It comes equipped with a 15mm rod clamp for attaching to rail support systems as well as a 114mm clamp adapter for mounting directly to cinema lenses featuring a 114mm diameter like Zeiss CP.2s and Canon C-NE primes. Please note, not all cinema lenses feature a 114mm barrel and a rail system will be required for most newer cinema lenses. A French flag, side flags, and rotating filter stages (including two 4 × 4″ and two 4 × 5.65″ filter frames), round out the kit, making it one of the most versatile we offer.