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Celestron Cosmos 90GT Wi-Fi Télescope
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Description du produit
the first Wi-Fi operated telescope for amateur astronomy. control Your telescope with the free app Celestron COSMOS Navigator for iPhone, iPad, Android devices, and the fork telescopeÕs arm features a 3D Spaceship of the Imagination SOTI (Design) with LEDs that When Women 's illuminate Your telescope is connected via Another WiFi. symbol of the eye nebula, COSMOS, adorns the Refractor tube. ,the COSMOS 90GT, creates its own wireless connection, so it can communicate with Your device even in remote locations where WiFi or cellular network arenÕt available. is Getting ready to observe and thanks to quick painless CelestronÕs award-winning SkyAlign technology. Centre any three bright objects in the Eyepiece, and its position. calculates Your telescope you can even sky generate a Tour of all the best celestial objects to view Your based on exact time and Commission considers, ,This 90 mm Refractor with fully coated glass optics provides outstanding views of the planets, Moon, and more. nebulae, and Choose the object you wish to view from Celestron COSMOS NavigatorÕs Database of over 120,000 celestial objects. a newly designed accessory includes storage tray for eyepieces along with a rubber-lined tray for Your smartphone, tablet. or small ,Interact with the night sky in a whole new way using the COSMOS 90GT Wi-Fi and Your telescope tablet or smartphone! new Celestron COSMOS Navigator Our mobile app replaces the traditional telescope hand control for a 100% wireless experience. Just hold Your smart device up to the night sky. When you find an object youÕd like to view, tap the screen. Your COSMOS 90GT slews automatically to the object, while the screen displays information about it. ItÕs never been more fun to explore the universe!,,,, Optical Design: Refractor Aperture: 90 mm), Focal Length: 910 mm Focal Ratio: 10.1, Eyepiece 1: 25 mm (8 x magnification, Eyepiece 2: 10 mm (3 x magnification), Navigational Database: 120,000 objects, Weight: 6.4 kg
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Commentaires client les plus utiles sur Amazon.com
1. I liked the idea of the interface with my iPhone and iPad. I had already been using the Celestron COSMOS Navigator App to just locate constellations and such, and I really liked the app. The thought of using it to control the telescope was very appealing to me.
2. Call me a geek, but I kind of liked the COSMOS features on the telescope. The light up SOTI, the COSMOS Eye Nebula, and the fact that it came with a Cosmic Calendar all tickled my fancy.
3. I live in a suburb of a small-medium city. It's not too bright, but I do live close to a couple of facilities that have some fairly bright lights at night. After looking around a bit and asking some questions, I found that refractors tend to be a little bit less affected by "washing out" from light pollution.
4. My main points of interest in the night sky were the planets. Primarily Jupiter, Mars, and Saturn...along with the moon. From my reading, the refractor telescope seems to be the best suited design for primarily viewing the planets.
I ended up ordering the telescope after a few weeks of deliberation.
When it arrived, I was initially impressed with the packaging. The look and design of the box was really nice. In fact, I plan on keeping the box to display in my hobby room, I was so impressed with how it looked.
I set about opening the box and getting the telescope built. In fact, I have a video of the unboxing, assembly, and first WiFi connection to the app. I will try to get it uploaded along with this review.
The telescope was easy to assemble. I followed the instructions and had no problems whatsoever with putting it together. A word of caution, when you are attaching the telescope mount to the tripod, don't tighten it as much as possible. I did, and it was a real pain to get it loosened so that I could level the tripod when I went to use the telescope for the first time. I've since learned not to tighten it as much as possible, just snug it up and then maybe another 1/8th of a turn and it'll be good to go.
The only slight hiccup with the telescope for me was the finder scope. I was able to get it aligned, however, it is at the extreme end of one of the adjustment screws. Basically, it can't go any more in that direction. I guess that doesn't matter, seeing as how it's aligned at about 1/2 mile very well, but I thought I'd mention it. I wish it had just a bit more throw in that direction, because I'm a bit concerned that having it tightened down the way it is may cause it to eventually not hold. With that said, I'll probably be replacing the finder with a right angle finder in the near future, simply for the ease of use. When using the finder in the field for things that are up high in the sky, it can literally be a pain in the neck as you crank your body around to get to a point where you can see through the finder.
After getting the telescope all built and the finder dialed in, it was time to see some stuff in the sky!!!
Or...not. Of course, the day I got the thing the sky was completely overcast all night. I was then informed that when you order a new telescope, the UPS man usually brings at least three days of clouds with him.
In short order, though, I was all set to get out and use the telescope. On the day that I was planning to use it, I took it out to check the alignment of the finder scope one more time. It was at this time that I had another self created problem. When I was packing the telescope back up to take it home from where I was checking the alignment, I wrapped the cord around the battery holder too tight, and managed to pull one of the wires out of the crimp connector. It was nothing a quick hit with a soldering iron couldn't fix, but do note that you shouldn't wrap that cord around the thing tight, because you might end up pulling a wire out!
After getting that sorted, it was time to take it out to the field. I have a few vacant lots behind my house, so I just took it out there and set it up.
Connecting to the telescopes WiFi couldn't be any easier. It's just like connecting to a home or work WiFi system, and once you've connected once you should automatically connect if there's no stronger WiFi signal in range.
This was when I ran into my second self created problem. It had gotten fairly dark, and I had absolutely no clue which items in the sky were considered "bright" objects. See, to use the alignment system on the telescope for it's automatic GoTo function to work, you must align the telescope to three bright objects.
I tried first using the moon, and then two bright objects...at least they appeared to be bright to me...about 120 degrees away from the moon on either side. I understood that using objects farther apart and in different parts of the sky works best for this.
I then tried using the moon and a star closer to it, then one on the other side of the sky.
I then tried skipping the moon and picking three stars on different sides of the sky.
Finally, I tried aligning it to two stars on one side of the sky that seemed the brightest, then one on the other side that was lower in the sky near some known light pollution. My thought process was that if this star could be seen through the light pollution, it must be bright.
Success!! The system told me that it was aligned, told me what I had used to align the telescope, and then I was able to use it.
I found that my alignment must have been off by just a few degrees, because as the telescope went to things, it was always off by the same amount. Not so much that I couldn't see an object, but enough that a few clicks of fine tuning were needed to get the object completely centered.
After checking around, I found the following tips for alignment.
1. Make 100% sure the telescope's tripod is level. If it isn't level, then the telescope won't know exactly what you're looking at when you get objects centered, and the way it does it's calculations for alignment will effectively be confused. I have found that using a level with the telescope mount not on the tripod works very well for getting the telescope completely level.
2..Do your alignment when it's just starting to get to twilight. Those first few stars that show up in the sky are the brightest, so if you use those you'll be getting three KNOWN bright objects.
3. Get objects centered in the 25mm eyepiece, then switch down to the 10mm eyepiece and make sure they are centered in that one, too. There's a good chance that what you think is centered in the 25mm eyepiece is really a bit off. I found when switching down to the 10mm eyepiece, I was always off a few degrees with my centering. After getting the object centered in the 10mm eyepiece, "unfocus" the star a bit to make it a big fuzzy ball. When you do this, you will more easily be able to see how close to the center of the eyepiece you are.
4. If you are trying to use the moon, you need to be very careful that you're actually centering on it. The moon moves fairly quickly, so getting it centered can be tough.
By following these suggestions, I've been able to get the telescope to align quickly and accurately on the first try when I use it.
Anyways, back to the use of the telescope...
Once you've got it aligned, I have found that the tracking and GoTo features work very well. Even if the alignment is just a hair off, you'll always find what you're looking for. I've been able to leave the telescope just sitting for about 20 minutes, then go back to it and the item I was looking at will still be right in the same spot on the eyepiece as it was when I left the telescope.
Keep in mind, if you want to track the moon you must use the app to select a different tracking method, as the default is to track the stars.
I wanted to take a moment to mention that the first time I was using the telescope, I accidentally pulled Saturn into view when trying to align the telescope. I was in a rush to try to get the alignment done, so I didn't spend a ton of time looking at it...but once I had alignment done, it was the first thing I went back to.
Seeing that planet was a very strange feeling. It was mesmerizing, almost zen like. It was easy to pick out the sphere of the planet itself and the separation of it's rings. Switching to the 10mm eyepiece just made it more amazing. I just looked at the planet for the better part of 20 minutes. I was completely in awe. For that little bit of time, it seemed like there wasn't anything in the universe but me and that object a billion kilometers away. THIS was exactly the reason that I wanted a telescope...to lose myself in the stars and planets of the night sky.
So far, I'm really loving the telescope. It works well, provides great views of the things I've been looking at, and comes fairly fully featured. I would suggest picking up a 2x barlow for some better magnification, but even without that you can still get stunning views of the moon, Saturn, Mars, and other objects in the sky. So far for me, Jupiter hasn't been able to be seen...it hides behind the tree line that's west of my home.
The tripod isn't the greatest, but it's also not as terrible as some reviews would have you believe. Make sure when you get it you tighten all of the hardware. Loose hardware leads to unsteady legs on the tripod. When you need to adjust the focus, you will have to give the telescope a few seconds to "settle down" from the vibrations, but I think that's fair considering the tripod came in a kit that costs less than a lot of tripods alone cost. I have found that if you suspend some weight from the center of the tripod, you can give the telescope a much more "planted" feel. Experiment with that to see if it helps with your tripod's sturdiness. This is an old photographers trick that effectively "loads" the tripod and forces it to be more sturdy due to the way the legs are now working. Trust me, it works.
There are a couple of things I'd like to see updated into the app itself. I'm honestly hoping that this new way of connecting a GoTo telescope to a controller via applications on tablets will yield quicker updates, fixes, and additions.
First, I would like to see some more alignment options. It's my understanding that with other NexStar telescopes you can do a two star alignment as long as a few other things are in order. I'd like that to be added. I'd also like the system to be able to align if I point it at KNOWN stars and tell it what I'm looking at. For example, I'm quickly learning the names of some of the things in the sky. I'd love to be able to get Mars in my eyepiece, then tell the system I'm looking at Mars. Then move to Antares, and tell the system I'm looking at Antares. Once it knows that those two things are what they are, I think it should be able to align.
Next, I'd like the app to run a bit smoother. It runs very smoothly all the time...except...when the telescope is actually slewing to an object. If you try to get it to do anything while the telescope is moving, it gets very slow to respond. I've found that quitting all of my other running apps minimizes this, but it's still something I think might be able to be worked out of the system.
Finally, the app tends to send the telescope in a direction that doesn't make any sense sometimes. For instance, if I'm looking at the moon and want to switch to Saturn, even though Saturn is about 90 degrees to the left of where I'm seeing the moon, from time to time the system will send the telescope the other direction...so it must now move 270 degrees to get to where I want it to be. I'm not sure if this is done on purpose for some reason that I can't think of, or if it's simply a strange glitch in the software. Either way, having it take the quickest and most direct route to the object you've selected would help preserve battery life, and it would also take a bit less time.
These things all seem like items that can be worked out of the system with an update, and I hope that will be the case.
For everything that I've looked at, and the fun I've had, though, this telescope fully deserves the five star rating.
I look forward to using it, and to getting some accessories to better my enjoyment of it.