Description

Although Baader officially calls this a T-ring, this bayonet offers far more. The Baader Protective T-Ring allows Canon EOS cameras to attach to standard 2" eyepiece holders. It is optimized for full-frame sensor cameras (such as the Canon EOS 5D), but can be used with any EOS camera. Since it has a wider clear aperture than the restrictive T-ring (42 mm) size, it does not vignette the light cone of fast optics.  Whereas it utilizes a 48 mm thread, it also includes a 48 mm to 42 mm adapter for using traditional T-thread accessories.

Baader has optimized the fit and tolerances between the camera bayonet and T-ring. This ensures that its connection to the EOS camera is wobble-free and has no lateral play, thus guaranteeing a stable image platform for long exposures.

One of the unique features of this “T-ring" is that it accepts internal filters (optional).  Baader unmounted 50.4 mm or 50.8 mm and Baader low-profile 2" mounted filters can be installed internally.

You may order this product without a filter or with a preinstalled filter for your convenience. You may purchase additional filters at a later date, if you wish. Choose the configuration that best suits your needs.

• Baader Protective T-Ring with Nosepiece without filter - BPEOS
• Without any filter. You may purchase a filter separately at a later date.
• Baader Protective T-Ring with Nosepiece with UV-IR filter - BPEOSL
• UV-IR filter preinstalled. .
• Baader Protective T-Ring with Nosepiece with H-alpha filter - BPEOSH
• H-alpha filter preinstalled. Please note that using the H-alpha filter requires that the camera has been modified and its internal filter replaced with an expanded range filter. Modification is not needed for the Canon 20Da and 60Da cameras. .

An additional benefit of these filters is to offer dust and moisture protection for your camera’s sensor.

Parts Included:

1. Protective T-Ring for CANON EOS body
2. Baader UV-IR, UHC-S or H-alpha filter (optional)
3. Temperature compensation ring (to prevent filter damage at high temperatures)
4. S52/M48 adapter ring (M48 corresponds to the international 2" Astro filter thread)
5. M48/T-2 insert ring
6. S52/2" Nosepiece (with additional 2" M48 filter thread on the front side)

Please see this linked for further information.