BinoViewer for Telescopes 200-400 then slide the bolt to

then slide the bolt to the end of the slot that is wider

With a generous 70mm aperture and 360mm focal length

Although it is a standout telescope on its own

and a filter wheel

BinoViewer for Telescopes 200-400 then slide the bolt toThe BinoViewer is a 1. 25 inch device that uses two matching eyepieces (eyepieces not included) to give you AWESOME two eyed views through your telescope. Because our minds are designed to see the world with both eyes open, when you gaze through a telescope with both eyes, the view is much better. The Explore Scientific BinoViewer features sliding inter pupillary distance adjustment, twist locks to keep your eyepieces safely installed, and a diopter