$384.95 CAD


Small Standard (S-SR) Small Thin (S-US) Medium Standard (M-SR) Medium Thin (M-US) Large (L) Xtra-Large (XL)

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$384.95 CAD

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Product Description

The new CFW3 series filter wheels are available in four sizes to accommodate filters from 1.25-inch to 50 millimeters square. The small and medium sizes are also available in SR/US variants, which accomodate different filter thinknesses.

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.

Recommended Filter Wheel / Gear Combinations

Filter Wheel Recommended Gears Note
  • QHY533M
  • QHY183M
There is no difference between S-SR and S-US expect their depth, so S-SR can be compatible with thicker 1.25" mounted filters.
  • QHY5III Mono Planetary Cams
CFW1.25" Adapter needed
  • QHY268M
  • QHY600M
  • QHY163M
  • QHY294M
  • QHY268M
  • QHY600M (PH/Pro)
  • QHY461PH
A special adapter needed when connecting QHY600 SBFL and CFW3XL, see


Model Back Focus Consumed* Filter Supported Available height limitation Weight
CFW3S-SR 20mm+4mm 7 position 1.25" mounted / 31mm unmounted 10mm 446g
CFW3S-US 15.5mm+4mm 7 position1.25" mounted / 31mm unmounted 5.5mm 419g
CFW3M-SR 20.5mm+2mm 5 position 2" mounted / 50mm unmounted 10mm 728g
CFW3M-US 17mm+2mm 7 position 36mm unmounted 5.5mm 691g
CFW3L 21.5mm 7 position 2" mounted / 50mm unmounted 10mm 911g
CFW3XL 21.5mm Slot1: 9 position 2" mounted / 50mm unmounted
Slot2: 7 position 50mm*50mm square
10mm 1500g

* Note: 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.
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).

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