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 7 filter positions for 1.25-inch filters, and a slimline OAG which is pre-set to be close to par-focal with most SX cameras. (The Lodestar X2 or UltraStar guide cameras are an ideal match to the OAG pick-off tube.)
The MIDI Carousel
This carousel holds: 7 x 1.25-inch round filters. Unmounted filters may be up to 5 mm thick.
Input and output adapters
The standard output adaptor ring is a male T-thread (M42 x 0.75 mm) threaded version, intended for coupling to an TRIUS PRO series camera such as the PRO-694 or PRO-814. On the input side (telescope) there is a female T-thread (M42 x 0.75 mm) adapter and an alternative female 48 mm is also supplied with the MIDI filter wheel. (Other alternative adapter are also available.)
USB Control and Power
The MIDI filter wheel uses the same control protocol as the smaller SX wheel and has both USB and serial inputs. The entire electronic assembly is USB powered and does not need an external power supply. (the serial input does require a small PP3 style battery, if this is used).
Overall dimensions: Diameter: 190 mm (7.5 inches) Thickness between input and output adapters: 37 mm (1.46 inches) Weight: 0.8 kg (2 pounds)