O.P.T.,there's just nobody better in the industry. Best product's, best support team,best company...simply put,they're the best. Have purchased a couple of the Canon eos adapter rings. They work PERFECT! For all eos slr's and dslr's. Don't waste your money on other more expensive product's that may not fit correctly. The AWESOME people of o.p.t. use these product's so they know what work's and what work's Great! So they sell what work's great! Thank you o.p.t. for being so AWESOME! DEAN Janson President and co-founder of The peoples astronomy club of Boise.

Overall good quality.

Excellent service and very quick response in these covid-19 times.

Haven't got a chance to use this product yet !! Because of circumstance beyond my control ?? But per agent at OPT Corp this item should fit the bill ..

The adapter works. Just be careful when rotating your camera. I had the threaded insert fall off because I didn’t realize I was rotating the insert inside the t-ring. However, a quick tighten of the Allen key fixed it right up. No issues since.

Great company, great products. Would love it if I could find some good tutorials on these more advanced scopes. OPT, great doing business with you.