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More Information  · Supplied Accessories  · Recommended Accessories Price $197.50 List Price $345.95 Magnification 38x Field of view 1000 yards 73' Near Focus 20' Eye Relief 18mm Exit Pupil 2.41mm Twilight Factor 58.48 Weight 3.1 lbs. Aperture 3.5" Length 11" Armored Yes Waterproof Yes Warranty Limited Lifetime Photographic Focal Length 1200mm Photographic Focal Ratio f/13.3

• 90mm f/13.3 Maksutov-Cassegrain optics
• internal flip mirror system for terrestrial and astronomical use
• 8 x 21mm erect image finderscope
• 32mm Plössl eyepiece (38x)
• waterproof rubber-armored body

    The Celestron C90 Mak puts good quality multicoated Maksutov-Cassegrain catadioptric optics into a waterproof armored body that will take unexpected downpours in stride. Like all Maksutov optics spotting scopes, such as the ultra-premium Questars, the C90 is exceptional for observing anything that is small and distant and needs a lot of power to resolve clearly. It provides sharp, high contrast images of distant birds and wildlife, details that are free from the distracting spurious color you’ll find in comparably-priced achromatic refractor spotters. Optically very nice, this Celestron 90mm Maksutov has the optical performance to keep you busy observing the land and sky for many years to come.

Features of this spotting scope . . .

• Maksutov-Cassegrain optics: 3.5" (90mm) aperture, 1200mm focal length, f/13.3 multicoated optical system. The 11" long optical tube weighs only 3.1 lbs with finderscope and eyepiece attached.

• Multicoated optics: The system’s Maksutov corrector lens is fully coated on both sides with multiple layers of antireflection materials for high light transmission and good contrast.

• Internal focuser: Focuses by moving the primary mirror fore and aft in the optical tube by means of a large focusing knob on the rear cell.

• Close focusing: Twenty turns of the slow, but very precise, focusing knob of the C90 moves the focus from the horizon down to a very close 20’. This is not as great a burden as it might first seem, as only a few turns of the knob in the middle of its rotation range will cover most of the medium to long distance observing situations the C90 is designed for. However, the relatively slow multi-turn focusing makes the C90 more suitable for observing stationary targets from distant locations, rather than trying to follow fast-moving birds in flight.

• Internal flip mirror system: An internal first surface flip mirror, operated by a knob on the rear cell, directs the incoming light either to a 90° viewing angle 1.25" eyepiece holder at the top of the rear cell for astronomical observing or high resolution mirror-image terrestrial viewing, or to the Cassegrain focus at the center of the rear cell. The Cassegrain focus is threaded to accept either the supplied 45° viewing angle erect image 1.25" diagonal for terrestrial observing or an optional camera adapter for terrestrial and astronomical photography. The correctly-oriented images in the 45° viewing mode are identical to what you see with your unaided eye, to make it easier to follow moving subjects. The flip mirror is a great help in photography, as you can observe your subject through the 90° eyepiece, flipping the mirror down to direct the light to the camera to take a quick photo whenever the subject exhibits interesting behavior.

• Eyepiece: Fully multicoated 1.25" 32mm (38x) Plössl eyepiece with a 1.4° field of view (73’ at 1000 yards). While this Celestron C90 Mak has excellent optics with sharp images, its field of view is somewhat narrow, due to the scope’s long focal length. However, the narrow field is entirely in keeping with the primary task of the scope, that of long distance observing. The eyepiece has a usable eye relief of 18mm for eyeglass use. In addition, any of nearly 200 different 1.25" astronomical eyepieces can be used with the C90, giving exceptional flexibility in choosing observing magnifications. For example, the optional Celestron 8mm to 24mm zoom eyepiece listed below provides very flexible viewing, with a zoom range of 50x to 150x, allowing you to instantly modify the magnification to suit the target distance and lighting conditions.

• Finderscope: 8 x 21mm straight-through crosshair design with erect right-reading images that give you the same image orientation you see with your unaided eye. Three collimating screws let you line up the finder crosshairs precisely with the center of the eyepiece field. The finderscope must be removed from the scope before the scope is stored in its case, but a quick-release dovetail bracket makes removing the finder just a matter of seconds. The finder can be reinstalled on the scope just as quickly, and the dovetail bracket system assures that the finder will be properly lined up with the main optics once in place on the scope. The finderscope eye relief is quite short at 8mm. It will severely vignette the field of view for eyeglass wearers.

• Waterproof armored body: The waterproof body is armored in grey rubber for a more secure grip in wet weather, a more comfortable grip in hot weather, and shock proofing.

• Flip-down lens cover: The lens cover is hinged and spring-loaded to flip down out of the way when the scope is in use, and flip back up to protect the objective lens for storage and transport.

• Tripod adapter: The scope has a mounting shoe with two standard 1/4"-20 thread mounting holes to let you use it on any suitable heavy duty photo tripod. The front hole is for visual use. The rear hole will help better balance the scope on the tripod when a camera is attached for terrestrial photography.

• Carry case: The soft-sided case is lined with rigid die-cut foam that maintains the case’s shape and cradles the scope securely for protection during transport and storage. The zippered case has both a shoulder strap and a carrying handle.

• Lifetime warranty: This Celestron spotting scope is protected by a limited lifetime warranty.