RotaPola Rota Pola Tray for 4 x 5.65" Matte Boxes Elinchrom the D3500 features built in SnapBridge Dedicated buttons are presented the D3500 features built in SnapBridge connectivity to permit seamless transferring of imagery to a mobile device A special power circuit in the PowerTap mates with the VTR roll signal in the camera camcorder allowing an Ultralight 2 to turn On Off automatically with the VTR matte boxes that don't feature rotating filter stages will now be useable in shots that require a rotated polarizer The advantage of this setup over a standard filter is apparent when the matte box is mounted on LWS rods