The Celestron NexStar 6SE is one of the best-known “first serious telescopes”. It pairs a 6-inch orange-tube Schmidt-Cassegrain with a computerised GoTo mount that can find thousands of objects for you. This page rewrites an earlier short listing for a 6SE sold together with an eyepiece and filter kit. It explains what the telescope is, what the kit adds and how to use both. Every specification below was checked against Celestron’s own product pages.
What kind of telescope is it?
A Schmidt-Cassegrain (SCT) is a compound telescope. Light enters through a thin glass corrector plate at the front, reflects off a curved primary mirror at the back, then bounces off a small secondary mirror and travels back through a hole in the primary to the eyepiece. Folding the light path this way packs a long 1500 mm focal length into a tube only about 41 cm (16 in) long. That makes the 6SE compact for its power and easy to carry.
Verified specifications
From Celestron’s NexStar 6SE product page:
- Optical design: Schmidt-Cassegrain with StarBright XLT coatings
- Aperture: 150 mm (6 in)
- Focal length: 1500 mm; focal ratio f/10
- Included eyepiece: 25 mm, giving 60x
- Finder: StarPointer red-dot finder
- Highest / lowest useful magnification: 354x / 21x
- Limiting stellar magnitude: 13.4
- Light-gathering power: 459 times the unaided eye
- Optical tube: 16 in (406 mm) long, 8 lb
- Mount: computerised single fork arm altazimuth mount, 12 lb payload capacity, 9 slew speeds
- Weights: tripod 9 lb, mount head 11 lb, total kit about 28 lb (12.7 kg)
- Power: 8 AA batteries or an optional 12V DC supply
- Hand control database: 40,000 objects
- Software: Celestron Starry Night Special Edition and the SkyPortal app
How the GoTo mount works
Before the mount can point at objects, it needs to know how it is sitting relative to the sky. Celestron lists several alignment methods: SkyAlign, Auto Two-Star, Two-Star, One-Star, Solar System Align, and EQ North / EQ South for use on an optional wedge. With SkyAlign, you enter the date, time and location, then centre any three bright objects in the eyepiece. You do not need to know their names. The mount then works out where everything else is.
After alignment, choose a target on the hand control. The mount slews to it and keeps tracking it as the Earth turns. The internal battery compartment keeps cables from snagging as the scope moves. Expect AA batteries to run down quickly in cold weather, so many owners use a 12V power tank instead.
What the accessory kit adds
The original listing bundled the telescope with an “eyepiece/filter accessory kit” but did not say which one. Celestron’s own 1.25-inch Eyepiece and Filter Kit is a common choice. According to Celestron, it contains:
- Five 1.25-inch Plössl eyepieces: 32 mm, 17 mm, 13 mm, 8 mm and 6 mm
- A 2x Barlow lens
- Six coloured filters (#12 yellow, #21 orange, #25 red, #56 light green, #58 green, #80A blue)
- A Moon filter
- An aluminium carrying case
To work out magnification, divide the telescope’s focal length by the eyepiece’s focal length. On the 6SE (1500 mm), the kit gives roughly:
- 32 mm: 47x, wide views of star clusters and the whole Moon
- 17 mm: 88x
- 13 mm: 115x
- 8 mm: 188x, good for planets on steady nights
- 6 mm: 250x, only worth using when the air is very steady
A 2x Barlow doubles each figure. The 32 mm plus Barlow gives about 94x, but the 6 mm plus Barlow (500x) is well beyond the 354x highest useful magnification Celestron quotes. In practice, the 32 mm, 17 mm and 8 mm (with or without the Barlow) cover most nights.
What can you see?
With 150 mm of aperture and a limiting magnitude around 13.4, the 6SE shows:
- The Moon: craters, mountain ranges and rilles in sharp detail. A Moon filter cuts the glare.
- Planets: Saturn’s rings and its largest moon Titan, Jupiter’s cloud belts and four Galilean moons, the phases of Venus, and Mars when it is close to Earth.
- Deep-sky objects: bright clusters, the Orion Nebula, and brighter galaxies, which appear as soft glows. Dark skies help a lot.
- Double stars: the long focal length makes splitting close pairs easy.
Coloured filters can slightly improve contrast on planetary features, but effects are subtle. Do not expect dramatic colour changes.
Tips for beginners
- Align the finder in daylight. Point the scope at a distant treetop or chimney, centre it in the 25 mm eyepiece, then adjust the StarPointer until the red dot sits on the same spot.
- Let it cool. A closed tube takes time to match the outdoor temperature. Setting it outside a while before you observe gives steadier views.
- Watch for dew. The front corrector plate can fog on damp nights. A dew shield helps.
- Start low. Begin with the lowest power eyepiece to find and centre a target, then increase magnification.
- Never look at the Sun without a proper full-aperture solar filter made for telescopes.
Who is it for?
The 6SE suits beginners who want a portable telescope that finds objects for them and is strong on the Moon, planets and double stars. If you mainly want wide views of faint galaxies from dark skies, a larger Dobsonian gives more aperture for the money. If you want something you can carry outside in one or two trips and be observing within minutes, the 6SE is a sensible choice.
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