Skywatcher 90 RA Polar Scope A400 More detailed info about atmospheric

More detailed info about atmospheric dispersion and the use of ADCs you can read here: Martin Lewis tells you what an ADC is and why you need it

Allows direct connection of Baader 2" Zenith Prisms and mirrors to Schmidt-Cassegrain telescopes

easy to use

Telescope Focal Length: 650mm (f/5)

25" (with camera adaptor)

Skywatcher 90 RA Polar Scope A400 More detailed info about atmosphericThe new Sky Watcher 90 Polar Scope Eyepiece now makes polar aligning your mount so much easier! The eyepiece sleeve securely clamps over the standard polar scope eyepiece using three non marring, plastic tipped, knurled metal thumbscrews. This is far superior method of clamping compared to similar looking products on the market that use only one clamping screw and more reliable than those using a brass compression ring, which can be problematic. The