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.

102mm Maksutov-Cassegrain Telescope    1325mm Focal Length, f/13 Focal Ratio    StarBright XLT Optical Coating System    NexStar+ Computer Hand Controller    40,000+ Object Database with Sky Tours    SkyAlign Alignment Technology    Multiple Slew and Tracking Rates    Single-Fork Motorized GoTo Alt-Az Mount    25mm Eyepiece, StarPointer Finder    Stainless Steel Tripod with EQ Wedge

• 4" (102mm) aperture
• f/13 focal ratio
• 1325mm focal length
• Maksutov-Cassegrain optical system
• Front convex meniscus lens corrects spherical and chromatic aberrations and comas (off-axis aberration) across the entire field of view
• Smaller secondary mirror versus Schmidt-Cassegrain reduces obstructions and increases contrast
• BK7 optical glass primary mirror
• StarBright XLT optical coatings: Multilayer aluminum/SiO2 (quartz)/TiO2 (titanium dioxide) mirror coatings with flat reflectivity across the light spectrum for both astrophotography/astroimaging and visual observation
• Multilayer MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide) anti-reflective lens coatings
• High-transmission water white glass corrector lens with 97.4% light transmission
• Resolution: Rayleigh: 1.36 arcsec / Dawes: 1.14 arcsec
• Secondary mirror obstruction: 1.25", 34.4% by diameter, 11% by area
• Internal 90° flip mirror: With the mirror flipped up, the 90° angle puts head in a comfortable viewing position when scope is pointed at or near the zenith; lay the mirror down to direct light to the visual back for astrophotography/imaging

• 2-line, 16-character LCD display
• 19 fiber optic backlit red LED buttons
• Database of over 40,000 celestial objects plus 100 user defined
• Automatically slew to planets, stars, constellations, and a variety of catalogs
• Camera control: For piggyback wide-field or conventional astrophotography through the optical tube assembly, the controller can automatically trigger the shutter release to capture the image
• Anti-backlash compensation programs out play between gears for more precise tracking
• Tour Mode: Shows a selection of the most popular objects for the time and date you are observing
• Constellation Tour: Allows you to take a tour of all the best objects within a particular constellation
• Alignment procedures: SkyAlign, Auto 2-Star, 1-Star, 2-Star, and Solar System
• SkyAlign alignment: Takes minutes, with minimal effort or experience—point the telescope at three bright objects in the sky, and the telescope does the rest
• Nine slew speeds: 4°/sec, 2°/sec, 1°/sec, 0.5°/sec, 2x, 4x, 8x, 16x, and 32x
• Sidereal, Solar, and Lunar tracking rates for observing the fast-moving moon, to slower-moving deep-space subjects
• Tracking modes: Alt-Az (default, for general GoTo use), EQ North (use for long-exposure astrophotography in Northern Hemisphere with EQ wedge engaged), EQ South (use for long-exposure astrophotography in Southern Hemisphere with EQ wedge engaged), Off (no tracking when using as a terrestrial spotting scope)
• RS-232 communication port allows for computer control
• Flash updatable via the Celestron website

Database Details:

• Solar system objects including the sun, moon, and planets
• Named objects
• Stars: Asterims, variable stars, double stars, named stars
• Caldwell catalog
• Messier catalog
• NGC catalog
• SAO catalog
• Constellations

Mount:

• Single-fork alt-az
• Dual-axis servo motors allow for precise tracking with virtually no vibration
• Motor resolution: 0.26 arcsec
• Optical encoders track mount movement to improve tracking and GoTo accuracy while allowing the mount to maintain alignment when moved manually
• Communication ports: Autoguider port, Aux port, hand controller
• Runs on eight user-supplied AA batteries or optional 12 VDC power supply

• Stainless steel legs
• Adjustable height accommodates a variety of observation positions or users
• Built-in equatorial wedge enables more precise tracking accuracy during long-exposure astrophotography
• Tray holds accessories such as eyepieces and filters and adds stability and vibration reduction
• Weight: 10 pounds

Eyepiece:

• 1.25" diameter barrel
• 25mm focal length produces 53x magnification
• Anti-reflection multicoated glass improves color rendition and contrast
• Threaded barrel accepts most 1.25" astronomical filters
• Fold-down rubber eyecup for use with or without eyeglasses

• Projects a single red dot in line of sight
• Unmagnified to make finding objects faster and easier
• Used primarily for alignment process

Related Questions and Answers

Q: 1. a) Can we use a power adapter (dc/AC/Car) with this if battery runs out ? If yes, which model ?

A: Yes, there are a couple power options for this. One can use the Celestron AC to DC Power Adapter, BH #CEACDCPA (https://bhpho.to/3yhjx6R). One can also use the Celestron Car Battery Adapter (25'/7.7 m), BH #CECBAU2000 (https://bhpho.to/3vNHf98).

Q: 2. Does this work natively with the app to locate planets, etc., or do I need to purchase the WiFi adapter?

A: 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. Nothing extra is needed to accomplish this.

Q: 3. can you get this both with the Observations accessory Kit and Observers accessory Kit?

A: cust is asking for a discount bundle..Jay tabi told me to tell you

Q: 4. can you purchase it with the Observation Kit and the Observer's Kit?

A: cust is asking for a discount bundle..Jay tabi told me to tell you

Q: 5. Can a t adapter be used with this to take pictures with camera?

A: Yes you can,

Q: 6. Can you use a hand controller thru the aux connectors and not just smart phone or tablet just in case say a person's phone or tablet breaks?

A: Yes, you can use a NexStar hand controller through the aux port to control the telescope. Sincerely, Garrett at Celestron

Q: 7. How we can connect one photo machine to the Celestron Astro Fi 102mm f/13 Maksutov-Cassegrain Telescope ?

A: If you are referring to Photography cameras we have a number of different T-Mount adapter for a variety of cameras. https://bhpho.to/2njCYde

Q: 8. I have a Meade equatorial mount tripod. Can this scope be purchased without the tripod?

A: The Celestron NexStar 4SE 102mm f/13 Maksutov-Cassegrain GoTo Telescope BH #CEN4SE • MFR #11049 is only sold as a complete set with OTA, mount and tripod.

Q: 9. What exactly can you see in detail with a telescope like this? Do you just see the moon in more detail, or can you actually see a bit more of the solar system? Sorry, unexperienced person here.

A: So it really all depends on where you live, and the light pollution. If you are in an area where there there is a lot of Light Pollution then you really won't see much. The Scope is an excellent Scope. If you are in an area with little to no light pollution, then yes this would be an excellent choice.

Q: 10. What solar filter will fit this scope?

A: Alpine Astronomical 100mm Baader AstroSolar BDSF 3.8 White-Light Digital Solar Filter for Telescopes BH #ALBDSF100 • MFR #BDSF-100 https://www.bhphotovideo.com/c/product/1348139-REG/alpine_astronomical_bdsf_100_baader_3_8_od_digital.html