The gear drive used for the QHYCFW2 is stable and reliable and it avoids any problem of cold rubber losing its friction in severe cold weather. Improvements over the previous model include changing the motor position to increase the working space between the CFW.
The specially designed filter carousel allows the installation of unmounted filters of different thicknesses. Filters of different thicknesses can also be installed on the same carousel at the same time. The filter wheel can be controlled by USB and is powered by USB when directly connected to the 4-pin port on QHYCCD cameras. It is also compatible with the 2-pin connectors.
The QHYCFW2 is overall a thin design. The medium ultra-thin version takes only 17mm. Nevertheless, the thickness of the upper and lower covers of the outer casing has been increased so that the color wheel is quite rigid and not likely to be deformed.
The filter wheel firmware is open source and compatible with Arduino. It is also compatible with the QHYOAG (off-axis guider).
QHYCFW2-S Small size filter wheel. Supports five 36mm unmounted filters. The filter wheel thickness is only 15.5mm. It also can support a replacement carousel for six 1.25-inch mounted filters (requires customization). The weight is 465 grams.