Extension tube for 174mm Mini?

MarshaWilcox

I’m looking for an extension tube for the 174mm Mini. I’m using it with the Celestron OAG and the tube that comes with it isn’t quite long enough to get good focus.

I got an extension tube (1.25” eyepiece barrel extension with 26mm setback) from Telescope Adapters, but it doesn’t thread onto the 174mm Mini - the threads on the adapter are larger than the opening in the tube that came with the camera.

I’d appreciate suggestions for an extension tube that will work with this camera.

Thanks!