Astro Physics Wide T-Ring for Canon - Compatible with Prime Focus Field Flatteners

Canon EOS Wide-Mount Camera Adapter with Stainless Steel Bayonet for Prime Focus Field Flatteners This adapter is designed to greatly reduce vignetting when using a DSLR camera with a focuser, making good use of a much larger than standard 1.875" diameter inside EOS bayonet. The main body is precision machined aluminum that has been anodized black, and the bayonet itself is machined stainless steel with both the body and the bayonet baffled and painted flat black on the inside. The bayonet provides precise and solid camera connection. Indeed, this adapter acts as the solution to a problem that has long assailed astro photographers; the small aperture of standard T-thread adapters causing serious vignetting issues when linking your DSLR Camera to a telescope. This was an especially harsh issue for those making use of the Astro-Physics 2.7" and 4" Prime Focus Field Flatteners; What good were pinpoint stars to the edge of a wide field when the edge of that field was darkened by the T-rin