Celestron nex star 127slt mak computerized telescope (black)
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Celestron nex star 127slt mak computerized telescope (black) Celestron nex star 127slt mak computerized telescope (black) Document Transcript

  • My Associates StoreShopping CartProduct DetailsCelestron NexStar 127SLT Mak ComputerizedTelescope (Black)From CelestronListPrice:$849.95Price:$409.98 & eligible for FREE Super Saver Shipping on ordersover $25. DetailsAvailability: Usually ships in 24 hoursShips from and sold by Amazon.com14 new or used available from $409.98Average customer review:(17 customer reviews)Product DescriptionDesigned to be an affordable entry level to mid-level computerized GoTo telescope, the NexStarSLT refractors, reflectors, and Maks are available in the most popular sizes and are loaded withvaluable design features. With preassembled, adjustable stainless steel tripods, and quick releasefork arms and tubes, NexStar SLT telescopes can be set up in a matter of minutes – with no toolsrequired! You can see details of the lunar surface, Venus and its phases, polar caps on Mars,Jupiter and its four moons, Saturn with its rings plainly visible and much more! Most NexStarSLT’s can also be used as a land-based spotting telescope.Product Details Amazon Sales Rank: #1875 in Camera & Photo Size: One Size
  •  Color: Black Brand: Celestron Model: NexStar 127SLT Mak Number of items: 1 Dimensions: 11.00" h x 19.00" w x 40.00" l, 20.00 pounds Battery type: Lithium IonFeatures High quality 127mm (5") Maksutov-Cassegrain Quick-release fork arm mount, optical tube and accessory tray for quick tool no set up StarPointer finderscope to help with alignment and accurately locating objects Auxiliary port for additional accessories such as GPS accessory Includes "The SkyX" Planetarium softwareCustomer ReviewsMost helpful customer reviews22 of 24 people found the following review helpful.Clever idea, poorly implemented.By Matthew FieldsNovember, 2012: After owning this product for 18 months, I am downgrading it.The optics of this scope are pretty good. And the idea of an alt-az tracking mount with go-tofeatures is sound. But the kit as actually delivered is problematic. If my experience is anyindication, about half of the time, the kit will be out of commission due to failure of criticalcomponents.As I noted in my original review, the Finderscope failed shortly after I got the kit, making thescope extremely difficult to aim and steer, and impossible to align for purposes of the trackingfeature.Since then, the Altitude motor has failed twice, and the plastic bracing of the tripod split clearthrough--fortunately NOT while it was holding the scope tube. Each of these situations hasmeant 2-1/2 months of the kit being out of commission while I begged Celestron for a returnmaterials authorization number, shipped the materials to Celestron, waited for Celestron to checkthe parts in, and then waited 6 weeks for them to service or repair the parts.The root cause is apparently low-quality materials, including cheap Chinese motors.Celestron sells the SLT mount, hand-controller, and tripod as a kit without any optics for about$350. I recommend steering clear of that kit and any kit containing a tripod or mount made byCelestron, including their much-ballyhooed self-aligning SkyProdigy mounts, which, in their
  • photos, appear to be made from the same underlying components.At this point I am more seriously looking at products from Orion and Meade to replace theunreliable components from Celestron.However, when the product actually works, it works fairly well, as I explained in my originalreview of this product from over a year ago, which follows below.--------------------------------Disclaimer: Im a rank beginner, and this is my first telescope.Intermediate and advanced scope owners tend to recommend a larger Dobsonian scope (eg Orion6- or 8-inch) without motors, as the way to get a lot of optics at a low price. But knowing that Iwas going to struggle to find anything fainter than Saturn, I shopped for something smaller andlighter that Id be more likely to use, with tracking so once I found something, I could show it tosomebody else. Tracking was important to me because the Earths rotation can otherwise makesomething drift out of the field of vision in just a few seconds.A telescope can basically be mounted two ways: Alt-Az and Equatorial. An Alt-Az mount hastwo degrees of freedom: Altitude (angle from nadir to zenith) and Azimuth (compass point). Anequatorial mount can be pictured as the same two degrees of freedom tilted up so that zenith isreplaced with the north (or south) pole, altitude is replaced with latitude, and azimuth is replacedwith longitude. On an equatorial mount, tracking is just counter-rotating once every 24 hours onthe longitude axis while doing nothing on the other axis, so a clock mechanism is all thatsneeded. Tracking is more complex on an Alt-Az mount, so a computer is needed. But physically,equatorial mounts are a bit more elaborate and thus expensive because the tilt towards northcreates balance considerations that alt-az mounts dont experience.So the upshot is that a budget alt-az mount that can do tracking is likely to have a computer. So,why not have a Go-To database with it? The database on this system has only about 4000 objectsin it--but for somebody like me, thats plenty, besides which larger Go-To databases tend tocontain tens of thousands of things that are too faint to see in a 127mm scope. I find the Go-Tofeature a blessing, showing me a bunch of things I wouldnt have been able to find by myself,and describing them in short encyclopedia entries that scroll across the hand-controllers display.The system ships in one big box, which is a bit awkward for handling. I used the internal box andbubble wrap plus some foam rubber of my own to fit the scope tube into a wheeled backpack,with tray, eyepieces, diagonal, finderscope, hand-controller, and accessory tray in their originalcontainers or bubble wrap in side pockets; a separate wheeled duffel proved perfect for the forkarm, tripod, and a red-LED flashlight that I purchased separately. That made the whole systemquite tolerably portable.The enclosed red-dot finderscope died after a little bit of use, apparently because internal wiresgot torn by the finderscope-alignment process. Celestron replaced it, and the replacement appearsto have a sheet of plastic protecting the wires. Without a finderscope (a low- or no-magnificationtool that you use like a gun sight), its very difficult to aim a telescope at anything, so the scopewas essentially crippled for everything except lunar observation until the replacement came--and
  • aiming at the moon was a bit of a struggle. A little QA problem, but kudos for their customer-service.This is a Maksutov-Cassegrain scope, which should not need collimation, but it arrived slightlyout of alignment. The primary mirror can be alignedto the secondary with careful use of 2mm and 3mm allen wrenches (not supplied), and Irecommend a pinhole cap (not supplied) for the procedure. Faint stars should turn intosymmetrical doughnuts when slightly unfocused. I find that having done this once, the scopeholds its collimation well.The set-up instructions worked for me the first time, and about 30 minutes into my first night, Iwas looking at Saturn. I recommend reading the instructions carefully to get the best results fromthree-star or two-star alignment (the latter requires that you be able to identify the two stars). Foreach star, youll first align it in the finderscope, press "enter", then center it in the eyepiece,before pressing "align". The mount wants the last moves to be up and right, so it can take intoaccount the play in the motor gears, else when you ask it to find things, they may be off-center orslightly outside the field of vision. The computer has a database of cities from which it canestimate your position on Earth; that combined with the current time from a cell phone isgenerally accurate enough to orient it. But if youre taking it to a remote field, you might want tolook up the latitude and longitude ahead of time.And a remote field is a wise idea--the darker, the better. Telescopes do magnify, but their mainpurpose is to collect light--to show you things too faint to see otherwise. City haze and nearbylight can interfere with that. Still, even in a city, this scope easily shows Saturn and Jupiter withsome detail, craters on the Moon, double stars, and some star clusters. Darker skies are needed ifyou want to try to see nebulae, remote galaxies, and other faint objects.The included diagonal--a mirror creating a 90-degree joint--makes the scope more comfortable touse and gets the image right-side-up, though it is in mirror image. If youre viewing fainterobjects and can deal with an upside-down-and-backwards image and a little awkwardness, youcan put the eyepiece directly on the scope tube to eliminate the light-loss from the diagonal.Doing so shortens the tube substantially, so youll have to re-focus.A minor design flaw in the fork arm is that the hand controller (and optional external power)plug into the rotating part of the base rather than the stationary part. The computer compensatesfor that with a "cordwrap" feature that remembers how far the arm has rotated, so that when youask it to show you an object, it may make a just-under-360-degree rotation in the oppositedirection to avoid getting making a mess of the wires.Motor speeds vary from tracking speed to 9 faster speeds arranged in powers of 2, so the fastestspeed, [ (2^9) * tracking speed ], is about 3 degrees per second. Thats a lot slower than you cantilt it by hand, but moving the scope by hand makes it lose its alignment, unlike the active-passive sensor systems on some more expensive systems. I havent found this to be a problem.8 AA alkaline batteries in the fork arm power the system, and are good for many hours of use--Celestron says about 3 hours, but I used my first set for about 9 hours over several nights before
  • they unceremoniously died. Celestron doesnt recommend rechargeable NiCads, claiming theydont produce a high enough voltage to even start the system. A 12V center-positive externalpower supply can be used, and Celestron and other vendors offer a longer-life rechargeablebattery system just for that purpose.When Ive used this at fairly dark locations, Ive been able to see quite a bit of detail. The opticsseem very nice.15 of 16 people found the following review helpful.Brill scope, Eyepieces could be better.By RoyDeBoy33Although I didnt get my 127slt on Amazon Im still gonna leave my opinion on this scope.Whenit arrived it was so easy to set up(NO PROBLEM IN SETTING UP ON YOUR OWN).On the1st clear night I had I took it outside and within 5 mins I was up and running Sky allign is soeasy to use, you just point it at 3 bright objects in the sky and the Nexstar hand control does therest.The only thing that stopped me giving it 5 stars is the eye pieces could have been a bit better.None the less its an excellent starter scope. Im in the process of saving up for my new scopealready and Im gonna stick with celestron, its the CPC1100 GPS Scope.8 of 8 people found the following review helpful.Great ScopeBy RobertI am thoroughly pleased with my purchase of this telescope. Alignment and tracking featureworks very well as long as you follow Celestrons tips in the manual. I leveled the tripod and putin the time and my lat and long to give as accurate a location as possible. It has several optionsfor alignment but I find skyalign to be the simplest and quickest. I used skyalign and chosebetelgeuse, jupiter and a bright star that I didnt know to align with and I was up and running. Iobserved Jupiter for over an hour with barely any perceptible drift. The tour function workspretty well, though I recommend a lower power eyepiece to start because it seems that how faraway you are from your alignment stars (or planets) has an affect on accuracy. Sometimes it putsobjects dead center, sometimes it will be toward a side of the eyepiece. The good news is thatyou can center it and the scope will continue to track it very accurately allowing you to swap in amore powerful eyepiece. On the topic of eyepieces, the ones that come with the scope feel verycheap. I would describe them as "plasticky". They work decently, but if you have any interest inmaking amateur astronomy a long term hobby, you will absolutely want to get some neweyepieces and a barlow. I wont fault Celestron for the eyepieces, I planned on buying better onesanyway. My only gripe, and not against the scope itself because it does its job splendidly, is thatthis scope doesnt come in a 6" or 8" aperture. It was working so well that I got selfish and wasyearning to see more. As far as accessories go, you will certainly want a power source that isNOT 8 AA batteries. The AC adapter and an extension cord comes highly recommended. Iwould also recommend the car cigarette lighter power cord as well if you plan on traveling fordarker skies. I considered purchasing a power tank but the majority of reviews have beennegative. The RS232 cord might be worth purchasing if you intend to connect your scope to acomputer but bear in mind that you will need a USB to RS232 adapter unless you have a decadeold computer that you still use. Why they use such a byzantine cable is beyond me. To sum thisup, I highly recommend the Nexstar 127 SLT if you have a serious interest in taking up
  • astronomy as a hobby. Operating the scope is a simple task and it provides some very nice views.Just invest in some quality eyepieces and a power adapter.See all 17 customer reviews...My Associates Store | Shopping Cart Browse by CategoryPatio Furniture SetsCamera & Photo Similar ItemsCelestron Nexstar RS 232 PC Inte...$13.86Celestron Power Tank$54.98Celestron 93625 Universal 1.25-i...$16.99 AccessoriesAmazonBasics Bag for Camcorders ...$12.49Nikon 10x25 Sportster Compact Bi...$49.89Corel Photo & Video Pro X3 B...$22.99