CFW3 Color Filter Wheel
CFW3 Color Filter Wheel
CFW3 Color Filter Wheel
CFW3 Color Filter Wheel


CFW3 Color Filter Wheel

Regular price
$ 259.00
Sale price
$ 259.00
Unit price

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


The QHYCCD 3rd-Generation Color Filter Wheel

The new CFW3 series filter wheels are available in four sizes to accommodate filters from 1.25-inch to 50 millimeters square.

For filter wheel control a custom QHY 4-pin filter wheel port is included that provides power and control signals for QHY dual control filter wheels like the series 3 filter wheels.  Both the series 2 and new series 3 filter wheels can be controlled by either an independent external program using the filter wheel’s USB port or via the QHY 4-pin serial port. When connected to the QHY 4-pin port there is no need for an additional power cable or control program.  All of the filter wheel functions are controlled through the camera and its operating Software.

The series 3 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 color for each filter position.  The tricolor LED assigns one unique color or combination of colors 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 center 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 configuration of the filter wheel includes:

  • M42 (M) to 2-inch extension ring
  • 400mm oblique ring
  • M3*6 screw × 6
  • M4*70mm hand screw × 2
  • M4*35mm hand screw × 3
  • M2*4 screw × 30
  • Φ2*4 red gasket × 60
  • Φ3*6 red gasket × 30
  • M2*6×21
  • M2*3 spiral guide column × 21
  • Φ3 red gasket × 21
  • DIN4 to R11 filter wheel cable (optional QHY22, QHY11 series application)
  • Communication line (optional QHY9 application)
  • Power splitter (optional QHY9 application)

Filter Wheel Specifications:

Filter Wheel Filter Supported Recommended Gears Back Focus Consumed* Weight Note
7*1.25-inch mounted/31mm unmounted QHY533M, QHY183M
QHY5III Mono Planetary Cams (CFW1.25”Adapter needed)
20mm (SR)+4mm (Adapter)
15.5mm (SR)+4mm (Adapter)
About 430g There’s no difference between S-SR and S-US expect their depth, but S-SR can be compatible with thicker 1.25” mounted filters.
CFW3M-SR 5*2-inch mounted/50mm unmounted QHY268M, QHY600M 20.5mm+2mm (Adapter) About 720g
CFW3M-US 7*36mm unmounted QHY163M, QHY294M, QHY268M 17mm+2mm (Adapter) About 700g
CFW3L 7*2-inch mounted/50mm unmounted QHY600M (PH/Pro) 21.5mm About 900g
CFW3XL 9*2-inch mounted/50mm unmounted


or 7*50mm square unmounted




21.5mm About 1500g A special adapter needed when connecting QHY600 SBFL and CFW3XL, see

*Back Focus Consumed

For the convenience of calculation, all the data displayed are the increase in the back focal length taken up by using the adapter, which is not necessarily equal to the thickness of the component itself.  All the adapter data provided by QHYCCD are based on the focal length increment. For More information please see:

The Calculation of Filter Wheel’s back focus consumed includes two parts: The thickness of  the filter wheel body (like the 15.5mm of CFW3S-US),   and the back focus consumed (like 4mm of CFW3S-US). Now new cams don’t need this adapter anymore, like QHY533M, QHY268M, QHY600M-PH SBFL, etc.

Mechanical Dimensions












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