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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
ZWO T2 Female to Female Adapter - 11mm

ZWO T2 Female to Female Adapter - 11mm

by ZWO
SKU ZWO-T2-T2-11
$18.00 - $18.00
$18.00
$18.00 - $18.00
$18.00
Price Match Policy!
  • Adds exactly 11 mm of spacing to your imaging train
  • Female M42x0.75 T2 threads on both sides
  • Connects two male T-threaded components
  • Black anodized aluminum construction minimizes reflections
  • Original replacement part for ZWO ASI1600 series cameras
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • ZWO T2 Female to Female Adapter - 11mm

    The ZWO T2 to T2 11mm Extender provides a precise 11mm of optical path length, connecting two male-threaded components with its standard female M42x0.75 T-threads. This black anodized adapter is the original equipment spacer included with all ZWO ASI1600 series cameras, making it the definitive replacement part for achieving correct back focus with that camera system.

    Achieve Critical 11mm Spacing

    This adapter adds exactly 11mm of distance, a critical value for achieving the standard 55mm back focus when using specific ZWO cameras, filter wheels, and off-axis guiders. Its female-to-female design allows you to securely join accessories that both terminate in male T-threads, such as a camera nosepiece and a filter drawer, maintaining perfect optical alignment.

    Durable M42x0.75 Construction

    Machined from a single piece of black anodized aluminum, the ZWO T2-T2-11 extender is both lightweight and rigid, preventing flexure in the imaging train. The interior surfaces are blackened to absorb stray light and improve contrast by preventing internal reflections from reaching the sensor.

    • Standard T-Threads: Features M42x0.75 female threads for universal compatibility with the vast majority of astronomy accessories.
    • ASI1600 Replacement: Serves as a direct, factory-spec replacement for the 11mm spacer originally included with ASI1600 cameras, ensuring you can restore your original imaging configuration perfectly.

  • What is the primary use for the ZWO T2-T2-11 11mm extender?

    The ZWO T2-T2-11 is used to add a precise 11mm of spacing in an M42x0.75 threaded imaging train. It's most commonly used to help achieve the standard 55mm back focus required by many field flatteners and coma correctors, especially with ZWO cameras like the ASI1600 series.

    Is this the same 11mm spacer that comes with the ZWO ASI1600MM Pro?

    Yes, this is the identical 11mm female-to-female T2 spacer that is included as a stock component with all cameras in the ASI1600 series. It is the official replacement part from ZWO.

    How do I use the ZWO 11mm extender to reach 55mm of back focus with an ASI1600 and a 20mm filter wheel?

    The standard configuration to achieve 55mm of back focus with an ASI1600 camera and a 20mm thick ZWO filter wheel often uses this extender. The optical path is calculated as follows:

    • ASI1600 Camera Sensor to Flange: 6.5mm
    • ZWO EFW (Electronic Filter Wheel): 20mm
    • This T2-T2 Extender: 11mm
    • ZWO 16.5mm T2 Extender: 16.5mm

    This combination totals 54mm, which is typically within the tolerance for most correctors. A 1mm fine-tuning spacer can be added if needed.

    Are the threads on this ZWO adapter male or female?

    The ZWO T2-T2-11 extender has female M42x0.75 T-threads on both sides. This allows it to connect two accessories that both have male T-threads.

    Will this ZWO 11mm adapter cause vignetting?

    The adapter has a clear aperture consistent with the M42 (T2) standard. It is designed to work without vignetting on sensors up to the Four Thirds format, such as the one used in the ASI1600 camera series. It may cause vignetting on full-frame (36mm x 24mm) sensors, which typically require wider M48 or M54 threads.

    What material is the ZWO T2-T2-11 adapter made of?

    This extender is machined from lightweight, durable aluminum and has a black anodized finish to minimize weight and prevent unwanted reflections within your optical train.

  • SKU ZWO-T2-T2-11
    MPN ZWO T2-T2-11
    Connector Type M42 x 0.75 (T2) Female, Both Sides
    Optical Length 11 mm

    • ZWO T2 to T2 11mm Extender

      × 1

  • ZWO 2-Year Limited Warranty