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This Telescope’s Optical System . . .

• Maksutov-Cassegrain optical tube: 4” aperture (1325mm focal length f/13) aluminum tube, 13.5” long, weighing less than 2 lbs. One-knob quick-release attachment to fork arm for fast assembly in the field. Guaranteed diffraction-limited optical performance. Celestron orange finish.

• Starbright XLT fully-multicoated: This state-of-the-art coatings package includes a high reflectivity multilayer aluminum mirror enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Maksutov corrector lens. Starbright XLT multicoatings give you higher light transmission for brighter deep space images. They also increase the contrast of subtle lunar and planetary details when compared with a scope with standard coatings or multicoatings. For more information on the XLT multicoatings, click on the “optics” icon above.

• Finder: Star Pointer non-magnifying variable brightness red dot-type. The Star Pointer is the quickest and easiest way to point your telescope exactly to the desired object in the sky. It’s like having a laser pointer that appears to shine directly onto the night sky. No need to worry about the inverted images that you see through traditional finders. Just align the red dot seen through the Star Pointer with the desired star in the sky. It’s that easy.

• 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.

• 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 mirror-image terrestrial observing), or to the Cassegrain focus at the center of the rear cell. The Cassegrain focus is threaded to accept either an optional NexStar 4SE-specific 45° viewing angle erect image 1.25” diagonal for right-reading (correctly oriented) terrestrial observing or an optional NexStar 4SE-specific camera adapter for terrestrial and astronomical photography. Standard SCT rear cell 5”/8”/9¼”/11”/14” photographic and visual accessories will not work with this scope.

• Eyepiece: 1.25” 25mm E-Lux Plössl (53x). The eyepiece field of view is 1° across, twice the diameter of the full Moon.

This Telescope’s Mount . . .

• Fork mount/drive system: The heavy-duty single fork arm is made of die-cast aluminum, so it is rigid and damps vibrations quickly. The optical tube is offset slightly so that its center of mass is over the axis of rotation of the mount, keeping the optical tube properly balanced in all planes. Built-in friction clutches in altitude and azimuth keep the optical tube fixed in place when eyepieces or accessory loads are changed. No mechanical locking levers or knobs are required.
      The 11 lb. mount includes slewing/tracking motors in both altitude and azimuth. There are nine user-selectable slewing/centering/guiding speeds – 6°/second; 3°/second; 1.5°/second; and 128, 64, 16, 8, 2, and 1x sidereal. There are also three selectable drive rates – sidereal, solar, and lunar. The drives normally operate in the altazimuth mode (right/left up/down) to locate and track objects for visual use and casual solar system photography. If long exposure deep space photography is planned, the scope can be converted to equatorial operation by adding an optional wedge. A compartment in the drive base accepts eight user-supplied AA batteries for powering the scope in the field. The Celestron Power Tank (#4512V) is a highly recommended optional 7 amp-hour capacity multi-purpose rechargeable 12V DC battery that can provide several nights worth of observing from a single charge. To conserve battery life, an optional AC adapter (#2338) is available to operate the scope from household current during backyard use.

• Computer control: The supplied NexStar computer hand control has a nearly 40,000 object database of stars and objects that it can locate and track for you. The database includes the complete RNGC, Messier, and Caldwell catalogs; selected SAO stars (including the best variable stars and multiple star systems); the planets; the Moon; and more. You can also store and edit the right ascension and declination coordinates of 200 objects of your own choosing, such as favorite deep space objects or the comet and asteroid coordinates published monthly in Astronomy and Sky & Telescope magazines.
      You have several ways to have the NexStar computer find celestial objects for you. The most popular and easiest to use is Celestron’s exclusive SkyAlign no-guesswork technology. After turning on the scope, simply enter the date and time and your location, then point the scope at any three bright stars, or at two bright stars and a planet or the Moon (you don’t even have to know which stars and planet you’re looking at, and you don’t have to know and locate specific stars as you do with other alignment programs). The NexStar computer will use the stars you’ve pointed at to model the sky overhead. Once it knows what the sky looks like, it’s ready to find and track nearly 40,000 objects for you at your command. Not all of the objects may be easily visible, however, due to the scope’s limited aperture.
      The computer hand control includes a built-in RS-232 communication port allowing you to use a CCD autoguider for deep space photography. It also lets you use popular astronomy software to control the NexStar from a lap top or personal computer for remote control point-and-click slewing. The hand control software can now be flash-upgraded from the Celestron website. You can always have the most up-to-date control program, database, and software features simply by downloading the new programs as they are posted. The scope can be operated with its ergonomically designed hand control conveniently docked in its fork arm storage compartment. You can also remove the control and its coiled connecting cord from the fork arm for hand-held use. There’s no need to worry about wrapping the cord around the mount as you walk around the scope to observe different parts of the sky. The hand control plugs into the fork arm rather than the base, so it always moves with the scope.
      The computer includes a camera control software program and a camera shutter cable. These let you remotely take a series of timed exposures using your digital SLR camera (connected to the scope by an appropriate camera adapter). This can be very useful during lunar or solar eclipses and during occultation events, since you won’t have to miss any of the sights while worrying about the operation of your camera.
      All of the database and scope operation information is displayed on a double line, 16-character, liquid crystal display on the hand control. There are 19 fiber optic backlit LED buttons to make it easy for you to control the computer without affecting your dark-adapted vision. If you are new to astronomy, you may wish to start by using the computer’s built-in Sky Tour feature. This program commands the NexStar 4 SE to find the most interesting objects in the sky and automatically slews to them one at a time for you to observe at your leisure. No matter what level of experience you start from, however, the NexStar 4 SE will unfold many of the wonders of the Universe for you, your family, and your friends. For much more information on the NexStar computer and the unique SkyAlign software, click on the “NexStar computer” icon above.

• Adjustable height altazimuth tripod: The 10 lb. adjustable height tripod has tubular chromed steel legs for stability, and a combined die-cast spreader bar/accessory tray that is cut out to hold two 2” eyepieces and four 1.25” eyepieces. The spreader bar is spring loaded, so that it can't accidentally detach from the tripod. Spring loaded attachment bolts, that also can't be lost in the dark, hold the telescope to the no-tool adjustable wedge tilt plate that allows equatorial tracking for astrophotography. The tilt plate has a built-in latitude scale and can be operated from 0° to 90°, allowing both polar and altazimuth operation without having to buy a separate wedge.

• Two-year warranty: All Celestron go-to telescopes have a two-year warranty, double that of competitive go-to scopes.