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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.
William Optics Micro 4/3 48mm T-Mount for Olympus - Black

William Optics Micro 4/3 48mm T-Mount for Olympus - Black

by William Optics
SKU WO-TM-MFT-M48
$45.00 - $45.00
$45.00
$45.00 - $45.00
$45.00
Price Match Policy!
  • Connects M48 Correctors to Olympus Micro 4/3 Cameras
  • Fixed 35.6 mm Optical Length for Precise Back Focus
  • Light-In Connection: M48 (Female) Thread
  • Light-Out Connection: Olympus Micro 4/3 Bayonet Mount
  • Durable Single-Piece Aluminum Construction
3 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • William Optics Micro 4/3 48mm T-Mount for Olympus - Black

    The William Optics Micro 4/3 48mm T-Mount provides a direct, secure connection from any M48 female thread to your Olympus or Panasonic Micro 4/3 camera body. Its single-piece design is machined to a precise optical length of 35.6 mm, achieving the ideal standard 55 mm total back focus requirement when paired with a Micro 4/3 camera body.

    Precision Spacing: Achieving 55mm Total Back Focus

    A field flattener or reducer-flattener only delivers sharp, point-like stars across the entire frame when the camera sensor is placed at a specific distance from its rear lens element. This William Optics T-Mount provides the exact 35.6 mm optical path length that, when combined with the internal flange focal distance of a Micro 4/3 camera, yields the total 55 mm back focus needed for William Optics refractors.

    Using this single, rigid adapter removes the guesswork and potential for tilt. The result is a mechanically solid imaging train and a flat, fully corrected field of view, letting you get the most out of your William Optics telescope.

  • What is the primary purpose of the William Optics M48 T-Mount for Micro 4/3?

    This adapter connects a field flattener or other corrector with a standard M48 (2-inch filter) thread to any camera body that uses the Olympus/Panasonic Micro 4/3 mount. Its main function is to provide an optical length of 35.6 mm, reaching a total system back focus of 55 mm once attached to your Micro 4/3 camera.

    Why is the 35.6 mm optical length of this William Optics T-Mount critical for imaging?

    Field flatteners are designed to work at a specific distance from the camera sensor (typically 55 mm total). If the spacing is incorrect, you will see elongated or out-of-focus stars in the corners of your images. Combined with a Micro 4/3 camera sensor distance, this adapter delivers the exact 55 mm total back focus needed to produce sharp stars from edge to edge.

    I have a William Optics RedCat 51. Is this the right T-Mount for my Olympus OM-D E-M1 camera?

    Yes, this is the correct adapter. The RedCat 51 has an integrated flattener that terminates in an M48 thread. The William Optics M48 T-Mount for Micro 4/3 will connect directly to the telescope and your Olympus camera, establishing the full 55 mm back focus for a fully corrected image.

    Can I use this William Optics M48 T-Mount with a non-William Optics telescope?

    Yes, provided your telescope's flattener has an M48 output thread and requires a standard 55 mm back focus when paired with a Micro 4/3 camera body. Always verify the back focus requirement of your specific flattener before imaging.

    Does the William Optics M48 T-Mount cause vignetting with my Micro 4/3 camera?

    No. The M48 thread provides a wide, fully illuminated light cone that is significantly larger than the sensor used in Micro 4/3 cameras. This ensures there is no vignetting or light fall-off at the edges of the frame caused by the adapter itself.

    Will the William Optics M48 T-Mount work with my ZWO cooled astronomy camera?

    No. This adapter features a bayonet mount for DSLR and mirrorless cameras like those from Olympus and Panasonic. It will not attach to a cooled astronomy camera, which typically uses direct threaded connections (like M42 or M48).

  • Light-In Side M48 (female)
    Light-Out Side Olympus Micro 4/3 Camera Mount
    Optical Length 35.6 mm (55 mm total back focus with Micro 4/3 camera)

    • William Optics Micro 4/3 48mm T-Mount

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  • William Optics 2-Year Warranty