Celestron NexStar 90 SLT Telescope Review

The Celestron NexStar 90 SLT is the perfect telescope for someone beginning in Astronomy. It is extremely light, very portable, and utilizes the awesome Maksutov-Cassegrain optical design. This design gives the user high magnifications in a small, compact package. The Maksutov-Cassegrain design is known as a “Planetary Killer” and for good reason. This small telescope has a focal length of 1,250mm which gives you nice view of the moon, planets, and even Globular Star Clusters. Double stars are easily split through this small telescope as well. This telescope has an objective diameter of 90mm which gives it good light gathering power for how compact it is.

The Star Locating Telescope (SLT) mount, is sturdy, and provides for accurate, smooth tracking. As with all Celestron NexStar telescopes, alignment is quick and easy. The system is very user friendly which is a big plus for anyone.

The telescope includes 2 Plössl eyepieces, a 25mm and a 9mm. With this telescope this equates to 50x and 139x powers. To get 139x power with this small telescope is really impressive. Jupiter shines through the NexStar 90 SLT.

This telescope also requires no collimation, as it is a Maksutov-Cassegrain. Collimation is very rare, and the telescope would need to go back to the factory to be collimated. This makes the telescope a perfect go-to telescope for camping, outdoor trips, dark sky visits, or for use as a spotting telescope. This is my grab n’ go telescope, and I have been nothing but impressed with it.

The telescope is so short in length that you can use it to view objects at the Zenith, which is a great feature, as objects look their best when they are straight overhead. The NexStar 90 SLT is the “baby” in the Celestron NexStar SLT line-up, weighing only 20 pounds. Don’t let this small telescope fool you though, it packs a lot of power in a small package, and is a personal favorite for how portable it is.

One recommendation I have is, if you can afford the Celestron NexStar 127 SLT, I would purchase that telescope instead. It has all the awesome features described above, but that extra 37mm of aperture will bring in even more light, and give you even better views. All in all, the Celestron NexStar 90 SLT is a phenomenal telescope for the avid outdoor traveler and beginner. Its portability is unmatched in any other computerized telescope, and it is an awesome telescope for the price.


abe lincoln says:

No colimation is reason enough to buy !

Robert Bennett says:

Slymin would you consider this one or Celestron’s 4se ?? I can’t decide and they are close in price and I see youve used both

Hek Lik says:

Titan my favorite dot object on my telescope

Dave Stapchuck says:

Hey Slymin thanks once again ! I just bought this scope and will be taking it with everywhere I go ( I travel all over the country) I find myself looking at the stars every night wishing I had my 6se. This scope was a no brainer !!!! It fits in my carry on backpack luggage 🙂 Once again Your Reviews Are The Best !!!! Thank You

Phil Nolan says:

Thanks for the great review and clearing up a few things that normally aren’t mentioned. I have just brought its big brother the 127SLT and want to get some great views of the moon. I have a Sony a6000 (mirrorless camera) that I will attach with a T-ring and T-adapter. Do you have any tips for astrophotography? BTW love the tee shirt !!

Michael Slack says:

Would you happen to know anything about the ioptron 6″ Computer Controlled Reflector Telescope with Digital USB Camera

cava1962 says:

Q : Can we plug a PC or professional photo camera in this type of telescope ?
Thank you …………

Phil Nolan says:

Thanks for the great review. I am a newbie, just brought the 127 Mak and wondered is it best to do a two star align or a three star alignment? Are there advantages and disadvantages for each?

Jessie Young says:

I’m considering the 90 slt as my first scope. It will be my only telescope for a few years at least. I will be viewing in my backyard in the city with very bad light pollution. I understand this telescope has a small aperture but will it be able to show some brighter dso in addition to moon and planets? What are some dso I can see it this in a badly light polluted city? I’m concerned I will run out of things to see with this telescope quickly.

Derrick Kirwa says:

Can you attach a DSLR to it

Akira Yamato says:

Can i use it without power?

Shooting Stars says:

Does the 127SLT come as an OTA only? I didn’t see it offered alone.

tapakegabrew says:

hey there slymin, great reviews thus far. i just have a few questions. if you dont mind. ok im a complete beginner to this and am interested in getting into ap. so without breaking my bank account i think ive narrowed down my choice to either the nexstar 127 mak or the nexstar 130 slt. im leaning toward the mak bc of your review..heres the questions: 1. does the mak hae the capability to use the lpf? i have a little light pollution and am sure that would knock it down a bit, and 2 since i want to get into ap would the neximage burst color cam be a good beginners point? mainly for planetary for starters and later on down the road ill figure out the deep sky stuff. think that is a good route for a beginner to go down?

starblazers1969 says:

Does the motor break easy? Are the gears made of plastic?  I am thinking of buying this telescope.

alberto albié says:

great video

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