Adapter ring that allows fitting of a t-ring to the following zoom eyepieces.
*Note , it comes as standard when you purchase the Celestron Regal ED XLT spotting scope with 20-60x eyepiece.

To fit
Unscrew the twist eye cup
Attach the adapter ring
Screw on your t-ring (not included)
You can then attach your SLR / DSLR body

Fits
Celestron Regal M2 8-24mm eyepiece
Olivon HR (not S-HR) 8-24mm eyepiece