The C90 Makr is a Maksutov-Cassegrain spotting scope from Celestron, offered as a potent alternative to their prismatic scopes such as the Ultima line.
The Maksutov-Cassegrain design combined with a large 90mm aperture affords significantly more usable magnification than a conventional refractor can achieve. The focal length of this scope is 1200mm, so you'll divide 1200 by the focal length of your eyepiece in use to determine the combination's effective magnification.
Beefy tripod adapter block
Internal flip mirror allows both straight & angled viewing options
Rubber armored protective housing
Focal length of 1200mm with an f/13.3 aperture