Celestron's NexStar 4SE 125mm f/13 Maksutov-Cassegrain GoTo Telescope is a powerful, versatile, and user-friendly catadioptric-style scope that can be used for observing everything from the moon and planets to bright deep-sky objects like stars, galaxies, and nebulae. Using Celestron's proprietary StarBright XLT multicoating system, light transmission is increased throughout the entire optical path with anti-reflection multicoated lenses, highly reflective multicoated mirrors, and crown optical glass elements. Similar to their Schmidt cousins, the Maksutov design exchanges the conventional front corrector plate with a convex meniscus lens, which results in a smaller secondary mirror?limiting obstruction and increasing contrast, while eliminating the need for periodic collimation. While the focal ratio is a relatively slow f/13, the scope's optical performance, added to the mount's precision tracking system and integrated equatorial wedge, allows it to be a competent astrophotography/imaging platform for the moon and planets.





Driving the dual servo motors on the mount is the brain of the NexStar 4SE: the iconic NexStar computer hand controller. Packed with 40,000 celestial objects, it can hold up to 100 additional user-defined destinations and is updatable via the Celestron website. It has multiple alignment procedures to get you observing fast?including the super-easy SkyAlign system. Capable of being used in the Northern or Southern Hemispheres, the NexStar has sidereal, lunar, and solar tracking speeds to accurately follow near- and deep-sky objects, plus nine slew speeds and the ability to automatically trigger a camera's shutter release for Fastar or piggyback wide-field photography or conventional prime-focus astrophotography.Transform your smartphone or tablet into a wireless controller for your computerized telescope with Celestron's SkyPortal WiFi Module. It plugs into the Hand Control or AUX port and begins to generate it's own WiFi signal to directly connect to your mobile device without the need for a router. Since it uses the telescope's power there are no batteries, plugs, or cables required.





The SkyPortal module works in conjunction with the free SkyPortal mobile app available for iOS and Android devices. The app features a database of over 100,000 objects with astroimages and audio descriptions of hundreds of them including the history, mythology, and key features of them. It can assist with the telescope alignment and if you hold the screen up to sky, it will identify the objects based on your location, date, and time. If you don't know what you want to look at, the SkyPortal app will take you on a guided tour.Celestron's Moon Filters are economical eyepiece filters for reducing the brightness of the moon and improving contrast, so greater detail can be observed on the lunar surface.


The clear aperture is 21mm for the 1.25" filter. Transmission is about 18%.