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.
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.
