Takahashi Wide Mount T-Ring for Canon EOS (DX-WR)

Product Overview

Takahashi's Wide T-Mount DX-WR for Canon EOS, part TKA01251, is the camera-side ring that mounts a Canon EOS DSLR or mirrorless body onto a Takahashi telescope's wide-mount system. Takahashi lists its telescope-side thread as M54 x 0.75 male, and the camera side bayonets straight onto an EF mount — mirrorless Canon bodies need an EF adapter in addition.

It sits at the very back of the imaging train, the last ring before the camera itself.

Who It's For

This is a good match if you shoot with a Canon EOS body and are building or completing a Takahashi wide-mount imaging train — the DX-WR wide ring, your Canon body, and this T-ring connecting the two.

Takahashi builds the DX-WR to two different taper diameters, 52 mm for Canon and 49 mm for Nikon, and the rings aren't interchangeable between mounts — Nikon shooters need the separate Nikon version.

Key Features & Design

• M54 x 0.75 male telescope-side thread: threads onto Takahashi's wide-mount ring system.
• Canon EF-mount camera side: bayonets directly onto a Canon EOS body.
• Wide taper design: Takahashi's DX-WR series uses a wider taper than the standard T-mount DX-S, aimed at reducing play with heavier bodies.

Recommended Uses

• Prime-focus imaging with a Canon EOS body through a Takahashi telescope's wide-mount system.
• Completing a DX-WR imaging train alongside the matching wide ring.

Compatibility and Accessory Notes

• Canon EOS (EF mount) only. It isn't compatible with the Nikon version of this ring — the two use different taper diameters.
• Threads onto Takahashi's M54 x 0.75 wide-mount ring, not directly onto a telescope's drawtube.
• Backfocus contribution: as the last part before the camera body, its contribution to total backfocus is normally worked out from your camera's own flange distance instead — send us your telescope and camera body and we'll work out the full spacing with you, alongside our Takahashi Back Focus Guide.

Good to Know Before You Order

• It needs the matching DX-WR wide ring ahead of it to complete the train — this ring alone doesn't attach to a telescope. Tell us what you already have and we'll confirm the parts list.
• Mirrorless Canon bodies — an EOS R-series body, for instance — need an EF-to-mirrorless adapter alongside this ring, since it's built for the EF-mount bayonet.

Frequently Asked Questions

Is it difficult to set up?

No — it threads onto the wide ring and the camera bayonets on the way any T-ring mounts.

Does it fit Nikon cameras?

No. Nikon F-mount bodies need the separate Nikon DX-WR ring, built to a different taper.

Does it come with the wide ring itself?

No — this is the camera-side T-ring only. The wide ring is a separate part.

Does it add optical path length?

Its contribution to backfocus comes from your camera's flange distance rather than the ring itself — send us your imaging train and we'll confirm the full spacing.

Bottom Line

In short: Takahashi's Canon EF-mount T-ring for the DX-WR wide-mount system — M54 x 0.75 to the wide ring, EF bayonet to the camera. It's what connects a Canon EOS body to a Takahashi wide-mount imaging train.