Connecting barlow between telescope and dslr - Konus 2x Barlow Lens 31.8mm with Photo Adapter for Konus Telescopes

This 2x barlow has a threaded top that mates with the T-ring for my Canon T2i DSLR camera. The bottom of the barlow fits into the receptacle on the 1.25 inch visual back of my Celestron NexStar 8SE telescope. The threaded top of this barlow is 1 and 5/8 inches in diameter which matches the inner diameter threads of my T-ring. That enables a connection that eliminates the need for a separate T-adapter. This specialized barlow is the only way I know to connect a barlow lens between a telescope's visual back and a DSLR camera. As a result one can effectively double the focal length of the telescope when using a DSLR.
Pros: T-adapter built into a 2x barlow
Cons: None

This review was written in the old system and had content requirements that are different than reviews written today.