Baader Diamond Steeltrack 2" Focuser For Refractors - BDS-RT 28mm The slot you see on

The slot you see on the top of the TeleVue 3" Ring Mount allows you to attach Televue accessories like the Starbeam

4" threads directly onto the STL11000 camera

This Prism is multicoated and built in a solid metal body

Minimum Magnification:  43

In these instances

Baader Diamond Steeltrack 2" Focuser For Refractors - BDS-RT 28mm The slot you see onBaader Diamond Steeltrack 2" Focuser For Refractors Baader Diamond Steeltrack (BDS RT) for Refractors with 80 mm focus travel Minimum height (as supplied incl. 2" clamp): 78 mm Minimum height (with optional S58 direct thread adapters): 65 mm Focuser weight (as supplied incl. 2" Klemme): 1. 160 g (40. 9 oz) Adapters available or under development to fit a wide variety of refractor telescopes NOTE: This product is specifically designed for Refractor