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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.
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.
William Optics Super High Precision COPPER T-Mount for Nikon Full Frame
William Optics Super High Precision COPPER T-Mount for Nikon Full Frame
William Optics Super High Precision COPPER T-Mount for Nikon Full Frame
William Optics Super High Precision COPPER T-Mount for Nikon Full Frame
William Optics Super High Precision COPPER T-Mount for Nikon Full Frame

William Optics Super High Precision COPPER T-Mount for Nikon Full Frame

by William Optics
SKU WO-YE-TR-BR48-N
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
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  • Solid Copper Construction for Maximum Rigidity
  • M48 x 0.75 Female Thread for Wide-Field Correctors
  • Designed for Nikon Full-Frame DSLR and Mirrorless Cameras
  • Prevents Vignetting on Large Sensors
  • Precision Machining for Secure, Flex-Free Connection
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • William Optics Super High Precision COPPER T-Mount for Nikon Full Frame

    The William Optics Super High Precision COPPER T-Mount connects your Nikon full-frame camera to any M48 (0.75 pitch) threaded flattener or field corrector, providing the large clear aperture required to prevent vignetting. Its solid copper body offers superior rigidity compared to standard aluminum T-rings, ensuring perfect optical alignment for demanding imaging trains that utilize M48 threads.

    Solid Copper Construction: Rigidity Beyond Aluminum

    Unlike standard T-rings made from lightweight aluminum, this William Optics T-mount is machined from a solid piece of copper. This deliberate material choice provides a significant increase in rigidity, eliminating the potential for flexure between your camera and the rest of your optical train. For imagers using heavy filter wheels or off-axis guiders, this robust connection ensures that sensor tilt is not introduced by the adapter itself.

    M48 Clear Aperture: Eliminating Vignetting on Full-Frame Sensors

    Standard T-rings use a smaller M42 thread, which acts as a bottleneck and darkens the corners of images captured with full-frame sensors. The William Optics T-mount utilizes the larger M48 thread format, ensuring the light cone from your flattener or reducer fully illuminates your Nikon's sensor from edge to edge. This is essential for creating flat, evenly illuminated astrophotos without the need for aggressive cropping.

    William Optics Copper M48 vs. Standard Aluminum M42 T-Rings

    Choosing the right T-ring is a critical, often overlooked, part of the imaging train. A standard aluminum M42 T-ring is sufficient for smaller APS-C sensors, but it presents two key limitations for full-frame users that the William Optics Copper M48 T-mount solves.

    • Standard Aluminum T-Ring's Limitation: Aluminum is light but can flex under the load of a heavy camera and accessories, introducing sensor tilt and elongated stars in the corners of your images.
    • William Optics Copper T-Mount's Advantage: Copper is a much stiffer material, providing a rock-solid, flex-free connection that maintains perfect optical alignment throughout an imaging session, even as temperature changes.
    • Standard M42 Thread's Limitation: The smaller M42 diameter physically vignettes the light cone, preventing it from covering a full-frame sensor and causing dark corners in your final images.
    • William Optics M48 Thread's Advantage: The M48 thread provides a wide, unobstructed path for light, guaranteeing full illumination for 35mm format sensors and enabling you to use the entire frame of your Nikon camera.

  • Why use a copper T-ring like this William Optics model instead of a standard aluminum one?

    A copper T-ring offers significantly higher rigidity than an aluminum one. This prevents flexure in the imaging train, which can cause sensor tilt and distorted stars, especially when using heavy cameras or accessories like filter wheels. The added mass and thermal properties also contribute to a more stable connection.

    What is the advantage of the M48 thread on this T-mount for my Nikon D850?

    The full-frame sensor in your Nikon D850 requires a large, fully-illuminated image circle to avoid vignetting (darkened corners). Standard M42 T-rings are too narrow and will constrict the light path. The M48 thread on this William Optics T-mount provides a wider clear aperture, ensuring the entire sensor is illuminated for clean, flat frames.

    Will this William Optics T-mount connect directly to my telescope?

    No, this T-mount is designed to connect your Nikon camera to a field flattener, reducer, or other corrector that has male M48 x 0.75 threads. You will thread this T-mount onto your corrector, and then the entire assembly connects to your telescope's focuser.

    Does the copper material add a lot of weight to the imaging train?

    Yes, copper is denser than aluminum, so this T-mount is heavier than a standard ring. However, this additional weight is a key part of its stability. The trade-off is a small increase in weight for a significant reduction in mechanical flexure, which is critical for high-resolution imaging.

    How does this T-mount help when imaging large targets like the Andromeda Galaxy (M31) with a full-frame sensor?

    When framing a large object like the Andromeda Galaxy (M31), you need to use your entire full-frame sensor. An M42 T-ring would cause vignetting, forcing you to crop the image and lose parts of the galaxy's faint outer arms. The William Optics M48 T-mount ensures the whole field is usable, allowing you to capture M31 in its entirety with even illumination.

    Is the William Optics M48 T-mount compatible with Nikon Z-series mirrorless cameras?

    This T-mount is designed for the standard Nikon F-mount. To use it with a Nikon Z-series mirrorless camera, you will need to use the Nikon FTZ (F-mount to Z-mount) adapter between your camera body and this T-mount.

  • SKU WO-YE-TR-BR48-N
    Camera Mount Nikon F-Mount
    Telescope Side Thread M48 x 0.75 (Female)
    Material Copper
    Sensor Compatibility Full Frame / APS-C

    • William Optics Super High Precision COPPER T-Mount for Nikon

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  • William Optics 2-Year Warranty