SBIG AFW Filter Wheels


SBIG AFW Filter Wheels

$1,999.00 USD


SBIG AFW Filter Wheels are our latest ultra-thin filter wheels for large format cameras.  With a thickness of only 0.55″ (14 mm), they add minimal back focus to your system.

AFW series wheels are compatible with all SBIG cameras using our “STX” style adapter plates.  This includes our popular Aluma AC Advanced CMOS models as well as our legacy STX and STXL models.

Compatible with All Large-Format SBIG Cameras

Two versions are available:

  • AFW-10-50SQ
    • 10 Filter Slots
    • 50 mm Square Filters
  • AFW-12-50R
    • 12 Filter Slots
    • 50 mm Round Filters

The AFW-10-50SQ is recommended for use with our SBIG Aluma AC4040 cameras, and legacy STX-16803, and STX-16801 cameras.

The AFW-12-50R is recommended for use with our SBIG Aluma AC2020 cameras, and legacy STXL series cameras.


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Product Description

Improved Filter Compatibility

In order to accommodate the most popular filter sizes, convenient spacers are included:

  • 3 mm filters – do not use spacer
  • 2 mm filters – align notches in spacer with mounting screws
  • 1 mm filters – flip over spacer so notches face the filter

Easy Installation

The AFW series filter wheels are designed to be quickly installed onto the camera without removing the carousel or individual filters.  Removing a single access cover provides access to the filter slots and camera mounting screws.

Two mounting screws are “captive” under the carousel, and can be accessed by turning the carousel by hand to align access holes with the screw heads.  The two remaining screws are freely accessible.  This makes installation and removal quick and easy.

Once the wheel is attached to the camera, a single cable is connected to the camera’s AUX port. This single cable provides all necessary power and control functions.

Dual Wheel Support

For those users requiring more filters, AFW series wheels include the ability to control two filter wheels.  Currently this requires an Aluma AC series camera and MaxIm LT or MaxIm DL Pro software.

A special adapter is used to stack two AFW series wheels.  A matching three-port low profile cable is included to connect the two wheels to the camera’s control port.

Our MaxIm LT and MaxIm DL Pro software allows you to configure “virtual” filter slots, that map to specific slots on wheel 1 and wheel 2.  Usually one slot is left blank in each wheel, allowing you to select filters from one wheel or the other.  It is also possible to arrange for two filters to be used per slot, depending on your requirements.

With one blank slot in each wheel, a pair of AFW-10-50SQ wheels allow you to use 18 filters.  Similarly a pair of AFW-12-50R wheels will allow you to use 22 filters.

StarChaser Autoguider and AO-X Compatibility

AFW series wheels are compatible with StarChaser SC-3, providing self-guiding in front of the filters.  They also work with our popular AO-X Adaptive Optics unit, providing the tightest possible star images.

Coming soon – available for preorder.

Additional Information

Computer Interface


OS Compatibility

Windows 32 and 64 bit OS, Mac


4 lbs

Filter Size

50mm Round, 50mm Square

Product overview

Product overview of AFW series filter wheels.


User’s Manual

Installation, and operation instructions for AWF-10 / AFW-12 Filter Wheels.



Backfocus Calculator Spreadsheet

This Excel spreadsheet helps you calculate backfocus distance for your system. If you do not have Excel it can be uploaded into Google Sheets.