Focus Scientific

Baader Protective T-ring camera adapter accepts 50.8mm (2\") filters for Canon EOS EF

The Baader Planetarium Protective T-ring adapter for Canon EF mounts is an ultra-precise T2 ring which minimizes unwanted movement inherent in the low-tolerance bayonet mounts found on inexpensive T-rings.

The largest possible free aperture of 47.3mm (1.86") is achieved using the M48 adapter ring, providing exposures free from vignetting with extremely short focal length scopes.

The protective T-ring accepts 50.8mm and 50.4m unmounted filter glass, as well as filters mounted in low-profile 50.8mm (2") filter cells with a maximum height of 6mm (not including filter threads). A Delrin temperature compensation ring is included to protect unmounted filter glass from damage caused by high temperatures.

When used with unmounted filters, the height profile of the T-ring is identical to other T-rings on the market. When used with Baader low-profile filter cells, the T-ring is only 0.3mm taller, which is negligible.

Three mounting adapters are included for maximum connectivity potential.

  • Low-profile 2" nosepiece
  • M42 x 0.75 ring adapter
  • M48 x 0.75 ring adapter

Additional adapters may be required to complete the connection to telescopes, spotting scopes and microscopes. If you're not sure, ask us.

Note: Filter not included with this product. This product is also available with an included clear, UV-IR blocker, UHC-S, or 7nm Hα filter.