Celestron C90 MAK 39x90 Angled Spotting ScopesThe Celestron C90 Mak is a 39x90 spotting scope with a 90 mm objective lens, employing a Maksutov Cassegrain design. The Celestron C90 Mak is 16 inches long scope and weighs 5. 0 pounds. The Celestron Mak C90 scope comes with a 39x eyepiece, angled at 45 degrees, but a 1. 25 inch adapter permits the use of any 1. 25 inch eyepiece. Multi coated optics enhance the light transmission for bright views. The durable C90 Mak is also completely waterproof.