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SBIG STX/STXL/Aluma AC Adapter Plates
SBIG STX/STXL/Aluma AC Adapter Plates
SBIG STX/STXL/Aluma AC Adapter Plates
SBIG STX/STXL/Aluma AC Adapter Plates
SBIG STX/STXL/Aluma AC Adapter Plates
SBIG STX/STXL/Aluma AC Adapter Plates

SBIG STX/STXL/Aluma AC Adapter Plates

by SBIG
SKU DL-10018
$99.00 USD - $149.00 USD
$149.00 USD
$99.00 USD - $149.00 USD
$149.00 USD
Price Match Policy!
  • Bolt-on telescope adapters for SBIG Aluma AC, STX, and STXL cameras
  • Standard four 6-32 threaded hole pattern on a 4-inch diameter circle
  • All plates are 0.200" (5.08 mm) thick
  • DL-10018 version offers dual backfocus: 5.08 mm (dovetail) or 17.02 mm (threaded)
  • Available connections: 2" barrel, 3" barrel, 3"x24 TPI thread, SCT, M48, and M42
Model
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SBIG STX/STXL/Aluma AC Adapter Plates

    The SBIG STX/STXL/Aluma AC Adapter Plates provide a rigid, secure mechanical interface between your large-format SBIG camera and your telescope's focuser. Each plate is just 5.08 mm thick and features the standard SBIG mounting interface of four 6-32 threaded holes on a 4-inch diameter circle. The original DL-10018 adapter provides both a 3-inch OD dovetail connection and a 3.00in x 24 TPI thread, adding either 5.08 mm or 17.02 mm of backfocus depending on the connection method you use.

    The 4-Inch SBIG Bolt Pattern for Aluma, STX, and STXL

    These adapters are engineered specifically for SBIG's large-body cameras and accessories that share a common mounting interface. This standard interface ensures compatibility across several generations of SBIG hardware.

    3-Inch Adapters: 17.02mm Backfocus and Maximum Aperture

    The DL-10018 provides a very robust connection to the telescope and the largest clear aperture, but may require adapters on the telescope side. It offers two connection types from a single plate. The DL-ACC09 offers a 3-inch eyepiece barrel interface that is directly compatible with many third-party large format focusers.

    • DL-10018 Dual Connection: Use the 3-inch OD dovetail for a minimal 5.08 mm of backfocus, or use the 3.00in x 24 TPI thread for a threaded connection that consumes 17.02 mm of backfocus.
    • DL-ACC09 3" Barrel: A 3-inch eyepiece barrel interface, directly compatible with many third-party large format focusers. For a stable connection, ensure at least three set screws are used in the focuser drawtube.

    2-Inch, SCT, and Threaded Adapters for Common Focusers

    The DL-ACC06 provides a 2-inch eyepiece barrel for the Aluma AC, STX and STXL bolt pattern. The M48, M42, SCT and STL thread versions are Diffraction Limited's adapter plates for compact cameras: they connect the AFW-8-36R filter wheel (used with Aluma CCD and STC cameras), the StarChaser SC-4C and older models such as the FW8-8300, FW8G/FW8S-Aluma, FW8G/FW8S-STT and OAG-8300 to a focuser draw tube or focal reducer/field flattener.

    • 2-Inch Barrel (DL-ACC06): A standard 2-inch eyepiece barrel interface, suitable for smaller sensors. This adapter may cause vignetting on large sensors, such as those found in the Aluma AC4040 or STX-16803 cameras.
    • SCT Thread (DL-40-12052-00): The 2" x 24 thread (also known as the small SCT thread) is compatible with many 8" through 11" Schmidt-Cassegrain telescopes.
    • M48 & M42 T-Threads: The DL-ACC07 (M48 x 0.75) and DL-40-12051-00 (M42 x 0.75) thread options are listed among Diffraction Limited's compact-camera adapter plates.

  • Which SBIG cameras and accessories do these adapter plates fit?

    These plates are designed for SBIG products that use the large four-bolt pattern (four 6-32 holes on a 4-inch circle). This includes the Aluma AC series, STX series, and STXL series cameras. They are also used to mount the AO-X adaptive optics unit and the StarChaser SC-4 guide camera to a telescope.

    I have an Aluma AC4040 camera and a 2-inch focuser. Which SBIG adapter should I use?

    While the 2-inch barrel adapter (DL-ACC06) will physically connect, Diffraction Limited explicitly warns that it may vignette large sensors like the one in the Aluma AC4040. To avoid light loss at the corners of your frame, you should use a 3-inch adapter like the DL-10018 or DL-ACC09, which requires a focuser that can accept a 3-inch connection.

    Which version connects to a Schmidt-Cassegrain telescope?

    The SCT Thread version (DL-40-12052-00) has the 2" x 24 thread, also known as the small SCT thread, compatible with many 8" through 11" Schmidt-Cassegrain telescopes. It is one of the adapter plates for compact cameras, designed for the AFW-8-36R filter wheel, the StarChaser SC-4C and older models such as the FW8-8300.

    What is the backfocus difference between the DL-10018's dovetail and threaded connections?

    The DL-10018 adapter offers two backfocus measurements depending on how it's connected:

    • When using the 3-inch OD dovetail (a slip-fit connection held by set screws), the adapter adds 5.08 mm (0.200") of optical path.
    • When using the 3.00in x 24 TPI threaded interface, the total backfocus added is 17.02 mm (0.670").

    How can I ensure a secure connection when using a barrel-style SBIG adapter plate?

    To prevent the weight of the camera from causing tilt or sag, a high-quality focuser is essential. Use at least three grub screws in the focuser's drawtube to firmly and evenly secure the adapter barrel, ensuring the camera is held stably and coaxially.

    Do these SBIG adapter plates fit smaller filter wheels like the FW8-8300?

    The DL-10018, DL-ACC06 and DL-ACC09 plates are for the four 6-32 holes on a 4-inch diameter used by Aluma AC, STX, and STXL cameras. The M48, M42, SCT and STL thread versions are Diffraction Limited's adapter plates for compact cameras, which can also be used on older models including the FW8-8300.

  • Telescope-side connection DL-10018: 3.00in x 24 TPI thread and 3in OD dovetail; DL-ACC06: 2in barrel; DL-ACC09: 3in barrel
    Camera-side connection SBIG bolt pattern, four 6-32 threaded holes on a 4 in diameter
    Length at minimum travel 5.08 mm
    Warranty 1 year
    Optical length (added light path) 5.08 mm (17.02 mm via 10018 thread)
    Versions STX/STXL Mounting Plate (DL-10018); STXL 2" Nosepiece (DL-ACC06); 3" Nosepiece (DL-ACC09); M48 x 0.75 (DL-ACC07); M42 x 0.75 (DL-40-12051-00); SCT Thread 2" x 24 (DL-40-12052-00); STL Thread 2.156" x 24 (DL-40-12053-00)

    • SBIG STX/STXL/Aluma AC Adapter Plates

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  • Diffraction Limited 1-Year Warranty