This is the standard 42 mm t-ring for Canon DSLR cameras. Use it with field flatteners that have the standard 42 mm thread.
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I purchased this so I could use my Canon T1i with my SV80A. It fits the camera correctly and allows the use of the FFFR that goes with the scope. The backfocus is correct and I reach proper focus exactly where I should. This T-Ring was the one I was referred to by Stellarvue. It's nice to be able to tell them what it is you need and know they will advise you correctly.
This T-Ring was recommended to me by Stellarvue so that I could use my Canon T1i with my new SV80A. Works perfect and as advertised.
Just a small complaint
Nicely made but the small screws which secure the ring should be either slotted or Phillips head.
I have a Celestron T-Ring, but there has always been some play in the bayonet connector, and I just learned to live with it. On a whim, I thought I would try the Stellarvue version and it is tight just like my lenses. I should also note that it does't look like the picture, do I don't know if they have different versions.