The Midi filter wheel with off-axis guide prism is a compact solution for mobile setups, or where the lightest possible wheel and guider are required. The wheel is USB controlled and powered, with either 7 or 5 filter positions depending on the size of the filters, and the OAG is pre-set to be close to par-focal with most SX cameras. The Lodestar X2/PRO or UltraStar PRO guide cameras are an ideal match to the OAG pick-off tube.