Celestron X-cel Telescope Eyepiece 21mm
Tuesday, December 1st, 2009 at
9:27 am
Here are some items you might buy on Ebay auctions:
celestron X-CEL TELESCOPE EYEPIECE 10MM
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US $24.99 (2 Bids) End Date: Tuesday Dec-01-2009 8:41:05 PST Bid now | Add to watch list |
celestron X-CEL TELESCOPE EYEPIECE 21MM
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US $24.99 (1 Bid) End Date: Tuesday Dec-01-2009 8:46:26 PST Bid now | Add to watch list |
US $14.75
molto bene
Six of one, half a dozen of the other.
Most of these scopes are made by the same company (Synta) anyway.
Le télescope Hubble observe une galaxie qui ralentit son activité
Nice clear video – the camera is doing a great job. Inspires me to try filming through an eyepiece.
DA21mmとか欲しいなー
i thought that reviews usually have results and trials, i don’t see that in this video, sorry.
One reason for piggybacking one telescope on another, this way one telescope can be used as and auto guider while the other telescope is being used for taking long exposures.
Some people use a smaller scope as the guider for the large scope.
A guider telescope is hooked up to the guiding controller that keeps the larger scope right on the object to be photoed
im gonna buy one
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“Though they are the largest and most widely scattered objects in the universe, galaxies do go bump in the night. The Hubble Space Telescope has photographed many pairs of galaxies colliding. Like snowflakes, no two examples look exactly alike. This is one of the most arresting galaxy smash-up images to date.”
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It uses fibre optics.
and it uses the principle of critical angle and internal reflection.
Internal reflection happens when you shine light from a more dense object such as glass..tube to less dense such as AIR.
Usually the light when it goes from one substance to another is REFRACTED.
Like when you look in the water of a lake the light is bent.
but when you look from under the water up. the light is also bent to a higher angle from the normal.
There is an interesting effect at a certain angle NONE OF THE LIGHT is let through the glass and all of it BOUNCES BACK. THIS is called internal relfection and it will keep the light in the tube going from one side to the other till it hits the END OF THE tube.. since the END OF THE tube is a different angle then the critical angle THE LIGHT it trasmitted out and is seen in the eyepiece.
…..——————————————
a……….a………..a……….a………a…………a
……a……….a………..a……….a……….a…
……——————————————-
the 'a' is the light bouncing.. the hyphens are the walls of the glass fibre and the dots keep the position only ignore them
Hope that helps
The game (28-24-3) vs (28-25-4) begins in less than 15 minutes Xcel Energy Center. Have a good one!
i just got the 12" orion intelliscope and it is awesome. i think orion has really good quality products i usually go with them when making certain purchases on items. and pretty good customer service.
i would go with orion xt6
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Kudt cpi.
AFP – European Southern Observatory astronomers have said they had uncovered the oldest stars in our galactic neighborhood thanks to a massive telescope installed in Chile.
Huge cost difference. HT Pathetic that Xcel Energy pushes mercury-laden CFL bulbs; LED fixtures have less environmental impact.
NASA Hubble Space Telescope Daily Report #5040|NASA Hubble Space Telescope Daily Report #5040 ..
ヤフオクで Contax G Carl Zeiss Biogon 21mm を落札！ 専用ファインダーなしで、リーズナブルな落札価格。Olympus E-P1 にマウント予定なので、ファインダー不要だから好都合♪ このレンズは Contax G 時代からのお気に入り。
Colorado regulators have reiterated that Xcel Energy may charge customers to recover $11 million on the project, which enables grid customers in Boulder to monitor and control their power usage to an unprecedented degree. But they rejected the utility’s plea to avoid a new proceeding that could result in a requirement that Xcel refund at least some of that money.
I LOVE THE SEIRES SO MUCH
No telescope "makes" you see stars and planets. All telescopes _allow_ you to see stars and planets, but you have to point the telescope. A telescope is an inanimate object and can't "make" anyone do anything.
You need to spend at least $200 to get a telescope which will give you satisfying views of stars and planets. Anything costing less than this is a kid's toy. If $200 seems a lot, remember that a telescope is a precision device, and ask yourself what a computer game console costs.
Here are a few web pages with good information on beginner's telescopes:
For more advanced information, read Phil Harrington's Star Ware, 4th edition (Wiley).
You'll get the greatest value for your money with a Newtonian reflector on a Dobsonian mount, such as these:
Buy from a store which specializes in telescopes and astronomy, either locally or online; don't buy from department stores, discount stores or eBay as mostly what they sell is junk. Find your local astronomy club and try out different telescopes at one of their star parties:
I strongly recommend that beginners steer clear of astrophotography until they have learned their way around the sky. Astrophotography is by far the most expensive and difficult area of amateur astronomy.
Many people who buy telescopes have no idea how to find interesting things to observe. A good introduction to finding things is NightWatch by Terence Dickinson (Firefly). A more advanced book is Star Watch by Phil Harrington (Wiley).
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You mean he rides a Harley Motor Bike?
It looks like you will be just to the right of the stage. See link below for seating chart.
http://www.xcelenergycenter.com/seating/concert.jsp
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Janco Canon Compatible EP-EX15 Eyepiece Extender for the Canon …
Planets, maybe. Galaxies, no.
I don't recommend refractors under $500 of any kind. I only recommend $500 refractors (and mind you, that does not include the mount, which will likely be an additional $1000) to anyone who is already an expert. And i expect to be soundly slapped by experts for even suggesting it.
The problem with the Astromaster 70 mm refractor is that it's only $100. For $100, you can hardly get a good tripod. And if the mount is poor, then the entire experience is poor, no matter how good the optics are. My guess is that that optics are OK. Except that it's not big enough for galaxies. Many would say that a refractor at this price range would have unacceptable chromatic aberration. That's probably right. But other than the mount and the optics, this is probably a great scope.
For $100 and less, the options are:
8x binoculars. Much over 8x, and you can't hand hold them, so you need a great mount, which is going to cost more than $100. I've got some great 10×50 binoculars which cost $25. They have poor close focus, which is SO not a problem for astronomy. It's not even a problem for the neighbor's window, (which i only know about because i'm a bird watcher, and follow the birds where they fly – how was i supposed to know). They're also fragile. But they'll last decades if they're not abused. But as they're 10x, i only use them with my $250 tripod. That's the breaks. And as they're straight through binoculars, it's really tough to see much that's over about 45 degrees up from the horizon or higher. And the best part of the sky (has the least amount of atmosphere to see through) is straight overhead.
There's another option. Visit a club. Both the clubs i belong to have public star party events monthly or more often. Both clubs have loaner telescopes for members. For $25 a year, i can use any of several scopes from 100 mm to 550 mm whenever i want. And cameras and filters and so on. I estimate that the break even point on membership is several hundred years compared with buying my own stuff. Here's a handy link to find a club near you.
If you still want your own scope, you need to spend $200. You want a dobsonian mount, because they're very cheap, and so simple, it's hard for manufacturer's to get it wrong. Then since this style mount as the opening at the top, you want a telescope design that also has the eyepiece near the top. That's a Newtonian. Fortunately, the Newtonian design is also pretty simple. Simple is cheap. So a Newtonian Dob has the best bang for the buck of any design. IMO, this is without regard to how many bucks you have. But under about $1000, it's important.
So here's the low bid for high quality optics on a rock solid mount that fits in your car and sets up extremely quickly. The xt4.5 from Orion. It's 114 mm. From dark sky sites, you can see galaxies. I've done that. But that's true for my 254 mm scope too. 114 mm is good, but 254 mm is better. That 254 mm is better is not controversial.
If you do buy this scope, you'll still want to visit a club. We can tell you what to look at and how, but having someone show you is something else again.
I'm not in disagreement with Geoff. I'm just slightly more specific, and more willing to point to a good product than he is. But what does he know of the low end? His budget was at least 5 times more than mine, which was likely 7 times more than yours. But i hang with guys that have 114 mm reflectors. They're cool guys who really know what they're doing. They're just not fabulously rich – or formerly fabulously rich like me.
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New blog post: pentax zoom eyepiece
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New pictures from NASA’s Wide-field Infrared Survey Explorer (WISE) space telescope have revealed a cluster of previously unseen young stars formed from a giant dust cloud.
The collection of blue dots — to the right of the centre of the dust cloud — are called Berkeley 59 and are thought to be just a few million years old, leading scientists to describe the discovery as a cosmic rosebud, as it is blossoming new stars.
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Thanks!!!NICE VIDEO!
no coment
You seemed to be arguing that science takes away the mystery and thereby diminishes our experience of the natural world, and for most people who study natural science, that is not at all the case. For most of us who study some aspect of nature, the amazement is not at all reduced, and may in fact be deepened. I know I have only found awe while learning about astronomy and cosmology, as well as biology. My wonder has not decreased one iota. Rather, it has increased by orders of magnitude.
wow … what a machine!!! I want one of this!!!
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21rules!!
It sounds like you have one of these:
It hasa 60mm objective, a 700mm focal length, and comes with 4mm, 12.5mm, and 20mm eyepieces. Lets begin by putting aside the barlow lens and the erecting lens. The erecting lens works best for terristial viewing and the barlow lens is not needed on this size scope.
Begin viewing with the 20mm eyepiece (35x), and find and center your target. Adjust the focus so that it is as sharp as you can get it. Now watch the object move across your field of view. Try adjusting your scope to keep ot right in the center. Once you get comfortable doing that replace the 20mm eyepiece with the 12.5mm eyepiece (56x). Notice that the object seems to be moving faster, it is much harder to keep it centered. But, learn to do so and practice until you are comfortable.
Finally replace the eyepiece with the 4mm lens. This should take your magnification up to 140x. Try to sharpen the image, but be aware that 140x may be too much for your scope or too much for prevailing conditions. If it is not really sharp then go back to the 12.5 eyepiece.
I entered Over the Moon Contest from B&H Fiction for a chance to win a Celestron 60mm telescope:
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