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Celestron NexStar 4SE Review – Partially Recommended

While small GoTo telescopes aren’t the most useful instruments for beginners interested in astronomy, the Celestron NexStar 4SE is not a terrible package.

Tested By

TelescopicWatch

3.9 /5
3.9

The Celestron NexStar 4SE was actually my first scope. Like so many newbie telescope buyers, I picked it at the advice of a few salesmen and one particularly well-known space website. It was not a bad first telescope, though I eventually outgrew it. The 4SE simply isn’t the best bang for the buck, and many of its “features” are gimmicks which merely add to the weight and complexity of the telescope. However, it does have a pretty decent build quality and no significant performance issues, which is why we still (partially) recommend it.

Ranked 11th among 28 telescopes
Rank 1
Zhumell Z8
Rank 2
Orion Skyline 8"
Rank 18
Celestron Nexstar 4SE
 

Amazon prices as of 2020-11-29 at 07:03

  • Very sharp optics
  • Quality mount with acceptable gearing
  • Acceptable aperture
  • Very stable
  • Good included low-power eyepiece
  • No collimation required
  • Small aperture for the price
  • Small maximum field of view
  • The wedge is overpromising and confusing for some users
  • Integrated flip mirror is somewhat pointless
  • Somewhat heavy
Optical Tube Rating 78%
Accessories Rating 80%
Mount Rating 72%
Visibility Score 70%

It certainly wouldn’t be our first choice, but the Celestron NexStar 4SE is an acceptable beginner’s telescope – albeit not a great one. While it won’t frustrate you with a wobbly tripod or bad optics, it isn’t capable of doing very much and is rather cumbersome.

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Recommended! Why?

The Celestron 4SE Optical Tube

The NexStar 4SE is a Maksutov-Cassegrain telescope with an aperture of 4” (102mm) and a focal length of 1325mm, giving it a focal ratio of f/13. 

The Maksutov-Cassegrain design uses a very fast spherical primary mirror with a meniscus corrector lens and an aluminized “spot” on the corrector serving as the secondary mirror. The 4SE, like most mass-manufactured Maksutovs today, is of a variant called the Gregory-Maksutov, where the secondary is nothing more than an aluminized spot on the back of the corrector lens.

Maksutov-Cassegrains, also referred to simply as Maks or Maksutovs, have small secondary mirrors, long focal ratios (typically f/12 to f/15), and the corrector lens and mirrors are very easy to make to high tolerances, making them provide stunning, sharp lunar and planetary views. Since the secondary mirror in a Gregory-Mak is simply an aluminized portion of the corrector plate, commercial Maksutovs almost never need collimation, and some don’t come with provisions to do it at all – though the 4SE has a few small collimation screws in the back that could be adjusted for collimation by an experienced user.

The 4SE also has an integrated “flip mirror” at the back, which means that there is a built-in star diagonal which can be retracted to allow light directly out of the back of the telescope and into a camera adapter, usually for a DSLR or mirrorless camera. However, this flip mirror simply adds some additional bulk and complexity to the telescope, requires an unusual threaded adapter to be utilized, and isn’t really necessary – a normal Maksutov gets by with the user just detaching the star diagonal, and the 4SE isn’t really intended for astrophotography anyways – especially not with a DSLR or mirrorless camera, which are primarily meant for long exposures.

Since it can only take 1.25” eyepieces, with its long focal length of 1325mm the 4SE is limited to a maximum field of view of around 1.2 degrees, or about 2.5 full Moons across – a rather small figure for a 4” telescope. A shorter and even slightly larger instrument such as the Orion StarBlast or Zhumell Z114 can get 3.6 degrees, while the very-slightly-smaller Zhumell Z100 or Orion SkyScanner can achieve a field of view of about 4 degrees across – triple and nearly quadruple that of the 4SE respectively (and they cost a fraction as much, to boot).

Of course, most of the advantage of that extra field of view is simply in finding objects manually, which the Nexstar 4SE does not need to worry about due to its fully computerized mount.

Price – $779.98

However, a wide field of view is still desirable for many of the large star clusters, asterisms and nebulae that a small telescope excels at. Make no mistake – the 4SE is really a planetary telescope, and most deep-sky objects either don’t really fit in its field of view, or don’t look particularly impressive. And if all you’re looking at is the planets, the Moon, and perhaps a few double stars, how much do you really need GoTo anyways?

Accessories

The 4SE comes with a single 25mm Plossl eyepiece, yielding 55x. This is good as a low-power or “finder” eyepiece for viewing deep-sky objects and initially aligning the telescope, but for optimal usage of the telescope you’ll want stuff for higher magnifications such as a 9mm or 6mm “goldline” or some other good eyepieces, and perhaps a 32mm Plossl for the widest field of view possible. The only other accessory included with the 4SE is its StarPointer red-dot finder, which is used for aligning the telescope’s GoTo system.

The NexStar 4SE Mount

The NexStar SE mount is similar in all versions, but the 4SE and 5SE have a shorter fork arm on the mount and a base with 3 foot-like bits sticking out, a holdover from the days of the NexStar 4GT, the 4SE’s predecessor which was sold as a tabletop telescope.

The mount is well-made. The gears in it are a bit better than the cheaper NexStar SLT scopes, but still have a lot of backlash – which is somewhat problematic when moving the telescope at high powers or attempting to shoot planetary images. The tripod legs are, however, solid steel, and the whole assembly is actually somewhat overkill for the 4SE’s tiny optical tube. One thing to keep in mind with the SE mount, however, is that the power jack can lose connection, which will shut down the mount and require re-booting and re-aligning it – however, installing AA batteries in the scope as backup will prevent this issue.

The 4SE’s tripod has a built-in “equatorial wedge” which theoretically allows the scope to be converted to an equatorial configuration. However, without accurate altitude adjustments or any azimuth adjustment to speak of short of picking up or kicking the entire scope/mount/tripod combination, and an equatorial mount is only needed for deep-sky astrophotography – something that the 4SE, with a focal ratio of f/13, is simply not capable of (the mount’s mediocre gearing quality doesn’t help, either).

The biggest issue I have with the 4SE’s mount, however, is that it doesn’t make much sense. The mount is 17 pounds – much more than it needs to weigh – and must be perfectly leveled during setup (especially if you want the SkyAlign easy-align feature to work). It either burns through lots of AA batteries frequently or needs a good, steady source of DC or AC power, and of course has to be actually aligned – all in order to use a scope that in all likelihood will rarely be pointed at objects that can’t be found with the naked eye, a simple star chart, or even a phone app like SkySafari – and all at the price of an 8” Dobsonian which has four times the light-gathering ability, double the resolution and similar setup time at worst.

What can you see?

The 4SE shines primarily on the Moon and planets. You can easily see lunar details just a few miles across, as well as the phases of Venus and Mercury. Mars will show its ice cap and some dark markings when it is close to Earth. Jupiter’s cloud belts, polar and equatorial zones, and Great Red Spot are visible, and its four largest moons, the Galilean Moons Io, Europa, Ganymede and Callisto, will appear as tiny, not-quite-stellar dots – with good atmospheric seeing, you can just see their shadows as they transit across the planet. Saturn’s rings, the Cassini division within them, and some faint, low-contrast cloud bands on the planet itself are no problem, and you should easily be able to catch its largest moon Titan – along with smaller moons such as Enceladus, hea, Tethys, Dione, and Iapetus. Uranus and Neptune are nothing more than turquoise and deep blue dots – you may struggle to resolve the latter as more than a star at all.

Outside the solar system, the 4SE is relatively limited. Most galaxies such as Andromeda, M81, and M51 will appear as vague smudges of varying size under all but the best conditions (Andromeda and M33 will also be unable to fit in a single field of view with the 4SE). M82 is the only one that might show any detail, especially under light-polluted skies – in the form of a cigar shape and dark streaks perpendicular to it. Globular clusters are merely brightish fuzzy balls with maybe the slightest hint of resolution.

A fair amount of open clusters are visible with the 4SE, but many will be visually unappealing to beginners or won’t fit in the field of view. There are also a couple dozen nebulae visible with the scope, but overall if you’re looking for mind-blowing views of deep-sky objects you should probably look elsewhere. Visible does not mean spectacular.

Astrophotography Capabilities

The 4SE does well at lunar and planetary astrophotography – we’ve attached a few images that I took with my 4SE and a cheap 640×480 webcam that I found at a flea market and attached a 1.25” nosepiece and 2x Barlow lens to. Forget deep-sky, however – the 4SE’s f/13 focal ratio, mediocre tracking capabilities, and the alt-az nature of the mount do not allow for good long exposure photos.

Jupiter photo using Celestron 4SE
Jupiter, 640x480 webcam, no Barlow
Moon picture using 4SE
Moon, 640x480 webcam, mosaic of 3 images, no Barlow

Alternative Recommendations

For a similar price to the 4SE, there are a number of other fine options you might want to look at, including the following:

  • Zhumell Z8/Orion SkyLine 8: Double the aperture means 4x the light gathering ability and double the resolution. Infinitely easier to set up and use. Better accessories.
  • Celestron Omni XLT 6: 2” more aperture makes for 2.25x brighter and 50% higher resolution, all-manual and well-made German equatorial mount, wide field of view.
  • Celestron Astro-Fi 130: 1.1” more aperture means 62% more light gathering ability and slightly more resolution. Superior GoTo functionality using your smart device instead of a keypad.
  • Celestron StarSense Explorer DX130: 1.1” more aperture means 62% more light gathering ability and slightly more resolution. Much faster setup, wider field of view, and easier to use.

Aftermarket Accessory Recommendations

The most important thing we’d recommend for the 4SE is probably more eyepieces. Specifically, a good high-magnification eyepiece in the 6mm to 9mm range such as “goldlines”, the Meade 8.8mm UWA, or another eyepiece such as a Baader Hyperion or Explore Scientific 82-degree. You might also want a medium-power eyepiece around 14-16mm. For the widest possible field of view and lowest magnification with the 4SE, a 32mm Plossl such as the Orion Sirius  is our favorite choice.

Another useful item is a real rechargeable battery to run the scope off of – the 4SE uses an enormous amount of AA batteries and will gobble through a set after less than 24 hours of runtime. This makes a rechargeable supply a great investment that will quickly pay for itself. We recommend the TalentCell 600Mah battery  and a male to male power adapter . You can use Velcro, zip ties or duct tape to secure the battery to a tripod leg.

Best pick in the category - Skywatcher 8" Dob

18 thoughts on “Celestron NexStar 4SE Review – Partially Recommended”

  1. I am looking at the 4SE because as you stated I’m a newbie and was intrigued by the features. So I’m looking for a better than average scope for viewing planets and if possible DSO’s. I’d prefer a simple set up and thats why I thought the GoTo appeared helpful, but if you’re saying its gimmicky, I can do without. What I would like is a scope for around $500 that has great optics, that will give me excellent detail of planets and would like to be able to see some DSO’s. I’d also prefer not to have to deal with collimation. Your recommendations please.
    Thanks

    Reply
    • 6″ or 8″ Dob, maybe a 10″ if you can stretch your budget. Even a 6″ will blow the 4SE away on all objects.

      Reply
      • Even though I respect the review, I have a 4se and it is pretty good for a newbie astronomer.
        I have made some good astrophotography not only planetary ones. My picture of Jupiter is far way better than that the autor posted on this review. Also, by using the mosaic technique I took lots of pictures of orion’s nebulae.
        Is it necessary an extra effort to achieve satisfactory results? Yes. But it is not impossible at all.
        Also I use its wedge mounting with no problem. It really works.
        Sky Alugn feature? Works like a charm. Rarelly fails.
        I live in south hemisphere and before I first used it I read at celestron’s web site that there was a bug on its firmware wich consisted in alignment failure if it is performed in south hemisphere. So, they offered an upgrade of that firmware.
        I downloaded it, followed the instructions and all get done without issues.
        I use this telescope since 2009. It does its job.

        Reply
        • Yeah, my astrophotos with the scope suck. Just thought I’d add them.

          It’s really hard to do deep-sky astrophotography the way Celestron advertises, and the wedge is not exactly…. precise.

          Reply
          • Hi Zane, being as I have over 1000 hours of observing under the belt on my 4se, I can say, for sure, the wedge does work, sky align works after the latest patch for the firmware (didn’t work for me before it 9/10 times).

            Given that you don’t tap the scope, and don’t care about the wait time, you can get some pretty amazing shots of galaxies and nebulae if you know what to do. the scope itself is pretty good for planetary, and some D.S.O’s, but in reality, the mount is more along the lines of a star tracker for DSLR’s when in EQ mode.

            The mount with wide field scopes works a charm, as if you opened a door into another dimension.

            I think its safe to say, ditch the mak, get a camera and a 70-300/500 mm lense, and the proper dovetail to match it.

            Hope this clears some stuff up about the EQ

  2. Hi there I am really just getting into astronomy. I did have a telescope about 15 years ago but like most people it was only a cheap one and I was left disappointed. After coming across this site it has kind of rekindled my interest and am looking to buy a new scope and wanted really to see the planets as best as I can but also as much as I can of deeper space. I read your comments about DOB scopes compared to the celestron 4se I do realise that the two are really for different types of scope and prices but I have been looking at either Celestron 11049 NexStar 4 SE or the SKY-WATCHER SKYLINER 250PX 254MM (10″) F/1200 PARABOLIC DOBSONIAN TELESCOPE… I am leaning more toward the DOB but would really appreciate your view on the matter

    Reply
  3. May I ask your advice about changing location a little bit more in details? You described the following feature of the telescope. I am going to buy 4SE in the USA and bring it back to Japan. Do I have to buy additional/other GPS module?

    “Also, changing location is quite complicated. The scope really needs to come bundled with Celestron’s SkySync GPS module for updating time/date and location, which costs over a hundred dollars.”

    Reply
    • Changing the location takes a while unless you happen to be located in one of the cities in its database (which still takes a bit). Not a huge deal, and you don’t strictly need the GPS.

      However, if you like to haul the scope to a dark site several hours from home and observe frequently from both locations, you really need the GPS module.

      Reply
  4. I got the 4SE Nexstar as an outreach telescope. I am experienced observer who has owned a number of scopes over the past 30 years. The general public is most impressed with views of the Moon and planets, and this OTA delivers really sharp views of those. Even brighter open clusters look great.

    I only use the manual 2-star alignment process, or even the Solar System align in the alignment menu, and tracking is great. GoTo slews are only as accurate as my centering of the alignment stars using a 10mm eyepiece. I would not recommend this to a novice. In my opinion, new folks should learn on classic, non-motorized 6 to 8 inch Dobsonians.

    Reply
  5. My wife bought this scope for me as a gift, although I had never used a telescope before. It’s sitting in a corner of my house unused. I cannot as a novice figure it out. Beginners obviously need to start with something simpler.

    Reply
  6. Found a second hand 4SE for 200$…If it works OK I’m going for it.. Appart from testing motor/gear anything else? The construction of the OTA is quite sturdy as I understand?

    Reply

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