The Mattebox Swing away 4x5.65 has a diameter of 143mm, for use with bigger lenses. This mattebox provides room for three 4x5.65" (Panavision) filters and side flags. It is the ideal mattebox for the Canon EOS C300/C500, Sony PMW F5/F55, ARRI ALEXA, ARRI AMIRA, AJA CION and the Blackmagic URSA.
An optional side flag kit for this mattebox is available. The swing away bracket enables you to easily change lenses without having to disassemble the mattebox. The Alphatron Mattebox 4x5.65 can also be used as a Clip-on mattebox, by disassembling the swing away bracket and removing the flexible stretch donut.