M48x0.75 ring with a mount for Canon DSLRs. Wide passage ideal for DS astrophotography. The "Copper" version is made of CNC brass technology and then hardened (hence the silver color). Unparalleled precision, rigidity, without any swinging or slack, unattainable in rings made of aluminum. An excellent ring for full-frame cameras, especially recommended for connecting with flatteners, to RedCat 51 and other telescopes from the high astrophotographic shelf. Weight: 155 g