Celestron COSMOS FirstScope Telescope
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- This telescope has a special edition COSMOS eye nebula wrap on optical tube.
- The FirstScope is lightweight and portable, a great grab-and-go telescope.
- A simple design makes it easy for beginners to use.
- No-tool setup means you are up and observing in no time.
- Includes a StarPointer finderscope, 2 Kellner eyepieces, free planetarium app, and Cosmic Calendar poster.
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From the manufacturer
Explore the universe with COSMOS: A SPACETIME ODYSSEY and Celestron
Introduce someone you love to the hobby of astronomy with the COSMOS FirstScope. This easy-to-use and super portable tabletop Dobsonian design is perfect for amateur astronomers of all ages. You can set up the COSMOS FirstScope in just a few minutes, so you can be observing the Moon, Jupiter, Saturn, and more in no time! The large 76 mm spherical primary mirror gives this Newtonian reflector plenty of light-gathering ability. You’ll get bright, sharp views of celestial objects, and observe the Moon’s craters in crisp detail.
The Celestron FirstScope has been a favorite among new amateur astronomers for years. The new COSMOS special edition FirstScope offers many upgrades over the original, including 2 Kellner eyepieces and a StarPointer red dot finderscope. Weighing in at under 5 lbs, the COSMOS FirstScope is the perfect companion for camping trips, and all your outdoor adventures. When not in use, it's stylish enough to be a decorative fixture on your bookshelf or desk. You’ll also receive a beautiful Cosmic Calendar wall poster, and a free planetarium app for your iPhone, iPad, or Android device.
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|Shipping||—||FREE Shipping||FREE Shipping||$9.95||FREE Shipping||FREE Shipping|
|Sold By||Available from these sellers||Amazon.com||Orion Telescopes & Binoculars||Orion Telescopes & Binoculars||Amazon.com||Orion Telescopes & Binoculars|
|Primary Aperture||76mm||Under 80mm||100mm-150mm||Under 80mm||under-80mm||100-150mm|
|Item Weight||4.3 lbs||4.5 lbs||10.9 lbs||4 lbs||15 lbs||13 lbs|
|Lowest Useful Magnification||—||11x||16x||11x||—||16|
|Viewfinder||—||N/A||N/A||N/A||—||EZ Finder II|
22023 Features: -Includes star pointer finderscope, 2 kellner eyepieces, free planetarium app, and cosmic calendar poster. -Special edition eye nebula wrap on optical tube. -Lightweight, portable and great grab-and-go telescope. -Simple design makes it easy for beginners to use. -No-tool setup. -Cosmos collection. Color: -Black. Dimensions: Overall Height - Top to Bottom: -12". Overall Width - Side to Side: -10". Overall Depth - Front to Back: -8". Overall Product Weight: -4.3 lbs.
Top customer reviews
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If you are like me, totally clueless about vendors, brands and models in this space, you must find this Celestron - Cosmos - Firstscope - 76 business very confusing. So let me decode it. _Celestron_ produces several spheric reflector telescopes in the Firstscope series. _Cosmos_ is top of the line model. And, of course, 76 refers to its objective aperture in mm. (If you like car talk, you can say that Celestron is the make, Firstscope is the model, Cosmos is the trim and 76 is engine size.)
Let's look at some key points discussed in these reviews. The sturdy base has received universal praises. I heartily agree. The three rubber feet and the light construction allows extremely unpretentious setup: Three days after receiving it, my daughter and I watched this year's super moon eclipse by putting the base on the ground of a driveway near the gate of a garbage dump. It is also small enough to be carried to most any location in a trunk or in a backpack. And universal praise stops here. (As an improvement to the original, Cosmos also includes a tripod mount on the side knob.)
The fundamental flaw of FirstScope is the spherical primary mirror. (Although this was clearly marked on the box of Cosmos, S.R. Waldee didn't have the information on the original when he wrote his review in 2009 so he had to discover this using his trained eyes.) This takes away the main advantage of a reflector telescope over a comparable refractor. (If you haven't known, a parabolic reflector surface can focus light perfectly; no refractor lens can do this. A reflector is also free of colour aberration. This is a second major advantage over refractors. A third major advantage is weight, as mentioned above.) On top of that, its large focal ratio (1/4) makes spherical aberration very pronounced. More on this later.
Secondly, Waldee complains bitterly about FirstScope's positioning of focuser, which shoots upright. This is corrected in Cosmos, though, whose focuser is positioned at 45º. (The original FirstScope is the only one in the family with this flaw.)
In optics, quality of eyepieces in the original FirstScope have drawn particularly dismal reviews. (Same eyepieces ship with Cometron.) One of them, a 20mm Huygenian is dismissed as "UGH" in both linked reviews. The other, a 4mm Ramsden received mixed receptions from Waldee. On one hand, it is uncoated, contains only two lenses, and not of super high quality. On the other, though its extremely narrow field of view makes it very difficult to find viewing object, it also limits the problems caused by its optical deficiency. It even limits spherical aberration of the primary somewhat. In some deep space viewing, Waldee found it outperform a higher quality eyepiece of the same specification, partially because fewer elements gave less reflection. In fact, the SR4 became the only salvaged part from his toy purchase after finishing the review.
However, Cosmos comes with neither. Cosmos' two eyepieces are both of Kellner design, one 20mm, the other 10mm. Waldee faults inherent deficiency of Huygian design. I do not know what advantage a Kellner offers, but the image certainly isn't as blurry as described in the reviews. As to the Ramsden, one problem with the 4mm eyepiece is its extremely high magnifying ratio. (75x) This level of magnification is near diffraction limit of its 76mm aperture, and unsuitable for the optical quality of the scope in question. With the shortest focal length at 10mm, maximum magnification of Cosmos is only 30x, not enough to fully reveal the primary's defects. This is an advantage especially for first-time telescope users.
One more advantage of Cosmos is the inclusion of a red-dot (laser) finder scope. This addresses another complaint about lack of a finder scope - and Waldee advises against buying the optional package that includes a Galilean finder. (Cosmetron comes with that Galilean for $10 higher. A red-dot finder is easier to use for beginners. Cosmos is only $5 higher than Cosmetron, and optics is also better.)
In short, Cosmos FirstScope enjoys the same sturdy base and light body as all FirstScopes. It suffers from the same spherical aberration with a large focal ratio. But it corrects focuser positioning; its eyepieces are not as poor and more suitable for the design. It could work as a first telescope.
Waldee further described improvements he made to his tester toy, some requiring mechanic refit, some involves better eyepieces and viewscope. With these, he went on a serious deep space viewing spree, and was even able to make observations that others hadn't reported. (Before he threw most parts into trash.) The review is a delightful read if you are into hacking.'
Two more points.
- On the lack of a collimation mechanism, all devices at this price point lack one. I have some thought about this: As the second review explained, all devices use a spherical mirror for economy. Off-collimation means off-focus for a parabolic mirror, but not so much for a spherical one, a factor both reviewers omitted.
- Funny enough, whereas the better recommended Orion's FunScope (Orion 10033 FunScope 76mm TableTop Reflector Telescope Moon Kit (Blue)) is said to be a FirstScope clone with improvements, Cosmos FirstScope is as much a clone of the former, even the price point is the same.' The one improvement over FunScope, in my opinion, is the location of the tripod mount. Instead of putting it to the actual base, Cosmos has the mount on the side knob. The difference is that you can easily mount the scope to tripod with the base detached!
It was easy to set up and dial in the star finder attachment. I am at best an amature astronomer,
So I wanted a beginner telescope to use myself and share with my grandchildren ( all still under 10yrs)
This is the perfect scope for my intentions, it's sturdy and well made. Oh I didn't mention it's portable, so you can set it on the patio table, the rail on the deck or take it camping if you choose.
We are looking forward to the upcoming full supermoon, next weekend. So far we have been able to find and identifiy Mars
and Saturn. I can see the Moons craters in very good detail. We recently received our telescope and have had partly cloudy skies thus far. I'm sure we will have lots of fun gazing at the night sky this Fall.
I'm not a telescope expert, so I won't give technical review. But for looking at the moon or distant objects during the day, I like it.
Most recent customer reviews
Sees the craters on the moon!.
Been a bit cold though to fully use it yet.