The QHYCFW3M-US 7x36mm is a slim filter wheel that carries seven 36mm unmounted filters. It is intended for use with the QHY268 and the QHY600 range of  cameras. The US (slim) version consumes only 17mm of back-focus, compared to the standard filter wheel’s 20.5mm. This measurement does not include adapters.

The QHYCFW3 range

QHYCFW3 filter wheels utilize a new motor with direct drive and will reverse direction to take the shortest path when moving from one filter to another. For Example, in this demonstration the wheel moves from filter position 1 to position 2 to position 3 and then back to 1 again, over to position 7 and back to position 1 without ever making a complete rotation of the carousel.  This saves time if you’re doing a lot of filter changes in one imaging session.

LED changes colour for each filter position.  The tricolour LED assigns one unique colour or combination of colours to each filter position so you can tell if it’s moved to the correct position without removing it from the Telescope.

The CFW3 is also thin.  This feature and the short back focus of the COLDMOS cameras means you can add one of several camera lens adapters for Canon and Nikon camera lenses for wide field imaging with the filter wheel.

In the centre of the back plate is a 12-volt DC power port.  This port is threaded for a short extension cable that is supplied with the camera that securely attaches such that it will not accidentally disconnect while you are imaging.

The QHYCFW3 comes in four size categories: small, medium, large and extra large.