The Bintel Superview Camera Projection eyepieces are one of the simplest ways to couple your DSLR to a telescope. The top section of the eyepiece unscrews allowing an M57 to M42 adapter to be fitted. The M42 T-thread can then allow the appropriate T-Ring to be attached and thus adapts to your DSLR camera.
M57 to M42 adapter and T-Rings sold separately.
https://www.bintel.com.au/product/bintel-m57-m42-t-adapter/