Celestron NexStar 8SE Review

The Celestron NexStar Range of Telescopes

The Celestron NexStar telescope range is a series of catadioptric telescopes in four sizes. Catadioptrics combine mirrors and lenses to provide a long focal length in a relatively short body. (You can read more here)

In the range, there are 4”, 5”, 6” and 8” models.

Each model comes with an altazimuth mount. Also included are motorized go-to tracking with easy 3-star alignment (we'll look at that in more detail later) and a database of 40,000 objects.

At 8 inches of aperture, the NexStar 8SE is the ‘daddy’ of the group. It's a great choice if you’re an astronomy beginner or upgrader who:

• Has a decent budget (plan on spending $1200 - $1600, depending on accessories)
• A thirst for big light-gathering power
• Wants to see the best objects in the night sky within an hour of getting your scope

The 8" NexStar is more popular than both the 4” and 5” models, and collects 77% more light that the 6" model. In this review, we’ll break down why it such a desirable scope and, more importantly, whether it’s the right one for you.

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The 8SE Telescope and Optics

An 8” primary mirror is a thing of beauty.

With that aperture, you’ll be able to see objects down to magnitude 14, which just brings Pluto within reach if you have dark enough skies.

The optics in the NexStar 8SE are incredibly well made and provide brilliant image clarity and detail.

It’s aperture and focal length, mean the 8SE gives great viewing at the 150x to 200x magnification levels. This is ideal for the moon and planets, and you can push it beyond 200x for bright objects in good seeing.

Of course, it's big aperture will show dimmer objects like galaxies and nebulae in detail. Even if you've had a 6" scope before, this one, with its extra 2" of aperture, gathers 77% more light- which makes a big difference to what you can see.

What You Can See with the NexStar 8SE Telescope

At a dark site you should be able to see the following objects with this 8” aperture telescope:

• Cloud bands on Jupiter
• Jupiter's moons (and their shadows) transiting the planet
• Neptune and her moon Triton
• Saturn's surface bands and Cassini Division in her rings
• Many of Saturn's moons 
• Martian ice caps and little moons Phobos and Deimos
• Many, many galaxies and nebulae, including all the Messier catalogue

This article gives you much more detail about what you should expect to see with 8" of aperture, compared to just 6 inches. For example, looking at the second-last row, you'll see that a telescope of NexStar 8SE’s size will do a much better job of resolving double stars separated by less than an arcsecond.

A similar discussion about what the 8SE can see was had in the Stargazers Lounge forum, and you can read the conversation here.

Build quality is robust on the NexStar 8SE. That doesn’t mean it can be abused without consequence. But, it should suffer the odd knock in the field without you paying a heavy price for it.

This will make it easier to carry and provides your precious telescope with great protection during storage and transportation.

There's one final thing to think about when setting up your 8SE...

Temperature!

Like all catadioptric scopes, the tube is a sealed unit, so takes a long time for the air trapped inside to equalize its temperature with the outside world.

When there's a difference in temperature between the scope and the air outside, you don't get great performance.

For best viewing, get the scope set up outside 2-3 hours before using it. If the night is cold, use a dew shield to prevent the scope misting up with condensation.

The NexStar's Altzimuth Mount

An altazimuth mount is one which can be simply moved up/down and left/right. This means you can point your scope at any part of the sky.

Unlike an equatorial mount, altazimuth mounts are not aligned to Earth's angle of rotation.

Why is that important, you might ask, well… unless you’re thinking about astrophotography, it’s not important at all.

The NexStar 8SE and Astrophotography

The 8SE comes with a computerised tracking motor and it will keep objects in your eyepiece as they slowly move across the night sky. For naked eye viewing, that's great.

However, if you do want to get into astrophotography, then the tracking motor coupled to an alt-az mount has limitations. In particular, there is some ‘drift’ of the scope over time. This means images with long exposure times will have trails on them.

Bright objects, such as the moon and planets, only need short exposures, so you can still produce great astropics of them with the 8SE.

But...

If deep space galaxies and faint nebulae are your things, then that's more of a challenge, although this guy seems to be doing just fine, judging from his pictures.

You can mount the 8SE on an equatorial mount and the Celestron C90 T-adapter and T-mount let you attach your DSLR camera to the 8SE.

Best Ways to Mount the 8SE

The major benefit of an altazimuth mount is you don't need to worry about polar alignment. Your scope is ready to go as soon as it's mounted.

When setting up the Celestron NexStar 8SE though, actually attaching the telescope to the mount is the most difficult part of setup.

Advice from owners is to attach the scope to the single-armed fork first (and on a soft surface like carpet to prevent scratches). Then, make sure it’s securely locked in place before finally attaching the fork to the stand.

You’re much less likely to damage the scope accidentally doing it this way. Because you won't be using the locking screws whilst holding a heavy telescope above waist height, there's less chance you'll slip and damage the scope.

One other piece of advice is to mount the telescope as far forward in its mounting housing as you can safely get it. This prevents the eyepiece hitting the mount when you point the scope towards the zenith.

The 8SE Single Arm Fork and Vibration Issues

For the NexStar models, Celestron has chosen to mount them on a single-armed fork.

That single arm has to support a lot of weight in the 8SE. Without a steadying second arm, you will see some minor vibration at the eyepiece when you touch the scope, such as when adjusting focus.

Thankfully, 8SE owners have come up with three ways you can manage this annoyance. From the cheapest to most expensive, they are:

• Pause in between each turn of the focussing wheel to let any vibration subside
• Get vibration dampening pads for the mount which will effectively remove most of the tremor
• Install a motorised focuser so you don't need to touch the telescope by hand

The Goto Motor and Space Object Database

So, you’ve got your wonderful NexStar 8SE mounted and ready to go.

It’s time to complete setup by telling it where in the world you are so you can find objects to look at with ease.

The database and goto motor take away all the heartache of trying to locate an object by map reading and star-hopping. Instead, with these clever electronics, you'll go straight to the object you want to see and use your precious viewing time studying it rather than trying to find it!

How to Use Celestron's SkyAlign Technology

A galaxy and nebula takes up such a small piece of sky that your telescope needs incredibly accurate aiming to get it centred in your eyepiece and then track it as Earth rotates.

To be as accurate as possible, Celestron’s goto system needs to know exactly where on the planet your telescope is and the precise local time.

Celestron's NexStar range has technology they call ‘SkyAlign’ to achieve this. For SkyAlign to work at its best, you need to do three things:

1. Your exact location
2. The local time (including time zone and daylight savings info)
3. Show it the location of three bright, night sky objects

Before doing any of that, you must make sure the telescope is level (it comes with a spirit level) and the viewfinder is aligned with the scope (otherwise you won't be able to point it at the three bright objects when the time comes).

The easiest time to align the red dot viewfinder is during the day. Point the telescope at a distant, stationary object like a telegraph pole, chimney or radio mast. Centre the top of the object in your eyepiece.

Now, without moving the main scope, adjust the viewfinder so that the same object’s top is in the very centre of the viewfinder. When it is, your scope and viewfinder are aligned!

At night, when you’re ready to use the scope, enter your location. You can use the nearest town, but you’ll have a better experience if you put in the coordinates of where you’re actually observing from.

Put the local time in the go-to controller. You also need to give your timezone and say whether daylight savings is in force or not.

That's it, you can now start observing!

Pick a star, planet or deep space object from the database and get looking.

Our advice is to do some daytime preparation for an evening's viewing. Make sure you know what's visible at the time and location you’ll be using the scope. That way, you won’t waste time trying to see stuff that’s not out.

Powering the Goto 8SE Motor

The biggest bugbear amongst users of the NexStar telescope range is...

Power supply!

The goto controller is ‘powered’ by AA batteries.

However, you cannot use rechargeables as they don't have enough ‘juice’, and even a decent branded set of AAs will get quickly eaten by your setup.

The reality is, they are really only there to retain information like date and time when the unit is switched off.​

However, despite many, many complaints across the internet, Celestron does not package the NexStar range with any power cable. You will need to get at least one of the following for any serious usage of the equipment, click to go to Amazon for a price (opens in a new tab):

• Power pack
• AC adapter

If you buy the adapter, make sure you get at least six foot of cord so you won’t pull it out moving the telescope around.

Your first night as an 8SE owner will be so much more rewarding if you've got your power source sorted!

Controlling the Goto 8SE Motor

The NexStar database has 40,000 objects stored within it. You select from planets, stars and deep space objects using the controller. Make your choice and the telescope will quickly slew to point at it.

As you get more into astronomy, you may want to use other software for controlling your 8SE. So, you’ll be pleased to learn that you can do exactly that.

What NexStar 8SE Owners Say

We think it’s really important to hear what existing 8SE owners have to say about the scope before you make a decision to buy it for yourself.

There are plenty of reviews around the Internet, so we’ve gathered a sample of views from owners of the NexStar 8SE. You can read the full detail by clicking on the links below.

Celestron NexStar 8SE Users' Reviews

• Great write-up from a newbie astronomer and their first experiences of a new 8SE
• Beginner's tips for getting the most out of setting up your new 8SE (RTM = read the manual)
• Here's another newbie owners guide. It's comprehensive, but the flashing adverts might put you off reading it.
• This is a 'proper' video review. It's useful, but at 18 minutes and all filmed in portrait (oddly) it's not easy viewing
• Amazon.com reviews. At the time of writing, the vast majority of reviews for the 8SE are four- or five-star. This is an incredibly comprehensive review and well worth a read.

If you take the time to read and watch these owner accounts, you will probably come away with the impression that we did.

Helpful NexStar Owner's Resources

We hope this comprehensive review of the Celestron NexStar 8SE has helped you make a decision.

If you go ahead and buy the 8SE the following links will help get the most enjoyment from your brilliant new telescope.

• NexStar 8SE Instruction Manual
• Quick Set-up Guide for the NexStar 8SE
• Dedicated forum for NexStar Telescope Owners
• NexStar 8SE astrophotography forum
• Expert amateur 8SE astrophotographer
• How to collimate the NexStar 8SE
• Dedicated NexStar resources website

This 8”, go-to telescope is a brilliant telescope for both beginners and upgrading novices.

You will love how easy it is to set up and use.

The images you see at the eyepiece will take your breath away if you’ve never used a scope before.

Heck, even if you’ve had a 6-inch refractor already, this one will blow your socks off as it gathers 77% more light. It will show you much fainter objects than you've ever seen for the first time.

From all you’ve read in this review, you buy the Celestron 8SE with your eyes open. You will have to buy another power source and vibration dampeners will be a wise investment.

Other than that, you are great to go right out of the box!

As one reviewer has said, ‘at this price point, buy it, and don’t think twice!”

We at Love the Night Sky think that is great advice, CLICK THE BUTTON BELOW if you do too...