Connecting SBIG AC4040 to PlaneWave 20 or 24

Discussion in 'Frequently Asked Questions (Public)' started by Colin Haig, May 25, 2022.

  1. Colin Haig

    Colin Haig Staff Member

    Oct 27, 2014
    I'm often asked what is needed to connect our SBIG Aluma AC4040 Ultimate Package to a telescope, such as a PlaneWave CDK20 or CDK24.

    You can calculate the backfocus of the SBIG items using the backfocus calculator spreadsheet on the main page, DOWNLOADS section for your camera. Or click here:

    Typically you will have a table like this:
    Aluma AC4040 Camera 0.855in 21.7mm
    Filter Wheel, AFW Series 0.550in 14.0mm
    Filter 3 mm thick -0.039in -1.0mm
    StarChaser SC-3 0.870in 22.1mm
    Adaptive Optics AO-X 1.049in 26.6mm
    Total Backfocus 3.285in 83.4mm

    On the PlaneWave side, they have a standard SureFit adapter plate that uses the 4-inch bolt circle we have for the STX10018 adapter plate that camera with the camera - you don't need this, and can save some distance.

    You likely will need a setup like these parts from PlaneWave:
    IRF-90 Focuser / Rotator
    600327 SureFit Adapter
    600328 SureFit Adapter
    200395-3 Adapter for Fingerlake Cameras to SecureFit Spacer 3"
    600337 Adapter 3"-24 female to SBIG AO-X/STX-FW bolt-pattern

    The 600337 is the "magic" that adapts to your SBIG stack of equipment. It replaces the 10018 adapter we provide. It fits the top of the AO-X, or SC-3, or AFW or FW7-STX, or AC4040/2020/STX/STXL.
    Both SBIG and another brand of cameras use the same 3-inch x 24tpi thread size, however you can save space using the SBIG and PlaneWave parts mentioned above.

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