Kowa TSN-66A PROMINAR 66mm Angled Spotting Scope BodyThe Kowa TSN 66A PROMINAR 66mm Angled Spotting Scope Body replaces the venerable TSN 663. The major upgrades include the addition of Kowa's Pure Fluorite Crystal objective lenses and using TE 11WZ II, TE 80XW eyepieces, and the other accessories used with the TSN 88 and TSN 99 bodies (see links in the optional accessories section on the right). Focus control has also been updated from a single knob to a dual focus system that allows rapid focus