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

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

by William Optics
SKU WO-YE-TR-BR48-C
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
Price Match Policy!
  • Solid Copper Construction for Maximum Rigidity
  • M48 (2") Female Thread for Wide-Field Correctors
  • Connects to Nikon F Mount Camera Bodies
  • Precise 8.2 mm Optical Path Length
  • Eliminates Flexure in Heavy Imaging Trains
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

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

    The William Optics Super High Precision COPPER T-Mount provides a rigid, M48-threaded connection for Nikon F mount cameras with a precise optical length of 8.2 mm. This solid copper adapter is engineered to eliminate flexure and maintain thermal stability, ensuring the 8.2 mm spacing is held perfectly constant even as temperatures change.

    Copper Construction: A Zero-Flexure Foundation for Your Imaging Train

    Unlike standard aluminum T-rings that can bend or shift under the weight of a heavy camera and filter wheel, this William Optics T-mount is machined from solid copper. This material choice provides a significant increase in rigidity, preventing tilt and ensuring your camera sensor remains perfectly orthogonal to the optical axis for sharp, round stars across the entire frame.

    M48 Threading for Full-Frame Nikon F Mount Cameras

    This adapter features the larger M48x0.75 thread standard on the telescope side, not the smaller M42 T-thread. This wider aperture is essential for full-frame Nikon F mount cameras, as it prevents vignetting by providing an unobstructed light cone to the large sensor. It creates a secure, wide-format connection to modern field flatteners and reducers.

    Copper vs. Aluminum T-Rings: Why 8.2mm of Stability Matters

    While an aluminum T-ring is lighter, copper offers superior thermal characteristics for astrophotography. As ambient temperature drops during an imaging session, aluminum contracts more significantly, which can alter the critical 8.2 mm backfocus and cause stars to lose their sharp focus. The thermal stability of copper minimizes this contraction, keeping your focus locked and your data pristine throughout the night.

    • Competitor Advantage: Standard aluminum T-rings are lighter and less expensive.
    • William Optics Advantage: The copper construction provides superior thermal stability and flexure resistance, protecting image quality in demanding conditions.

  • Why is this William Optics T-Mount made of copper?

    The copper construction provides superior thermal stability and rigidity compared to standard aluminum. This prevents focus shift from temperature changes and eliminates flexure in the imaging train, which is critical for sharp, round stars with heavy camera setups.

    What is the benefit of the M48 thread on this T-mount for my Nikon F camera?

    The larger M48 (2-inch) thread provides a wider, unvignetted light path to full-frame sensors. This is a significant improvement over standard M42 T-threads, which can cause dark corners in images taken with full-frame cameras like those using the Nikon F mount.

    Will the 8.2mm optical length of this William Optics mount work with my flattener?

    The 8.2mm optical length is designed to be part of a standard 55mm backfocus calculation. Always check the requirements for your specific flattener or reducer, but this T-mount is designed to integrate cleanly into common M48-threaded imaging trains.

    The product title says Canon EOS, but the specs say Nikon F. Which is it for?

    This specific model connects to a Nikon F camera mount. It is designed to adapt M48-threaded accessories to Nikon F-mount camera bodies. William Optics produces different models for various camera brands.

    How does the copper construction of the William Optics T-Mount help on a cold night imaging the Orion Nebula (M42)?

    During a long imaging session of M42, temperatures can drop significantly. The copper's thermal stability means it won't contract as much as aluminum, keeping the critical 8.2mm spacing constant and your focus locked. This prevents stars from bloating or drifting out of focus over several hours.

    Does the extra weight of the copper T-mount matter?

    While copper is heavier than aluminum, the small size of the T-mount means the weight difference is minimal and will not affect the balance of most telescope setups. The added rigidity and stability are a worthwhile trade-off for the slight increase in weight.

  • Telescope Side Connection M48 (female)
    Camera Side Connection Nikon F Camera Mount
    Optical Length 8.2 mm

    • William Optics Super High Precision COPPER T-Mount

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  • William Optics 2-Year Warranty