telescope refractor
Should I get a refractor or reflector telescope?
I live in light polluted san diego and I was thinking about getting an 8 inch orion dob, or another reflector, but I was wondering if it can even see through all the fog and light pollution and everything, and I was also wondering if it can be used for viewing the moon and planets as well as a refractor can view them, or is it only useful for viewing deep sky objects??? Also if you have any suggestions on what I should buy, my budget is about $400.
SCT Telescopes , add a bit more its worth it!
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Thinking about getting the Skywatcher Greatstart 70 AR-AZ2 70mm Refractor Telescope?
I heard this was a very good little scope for beginners. Is that so? What are your thoughts on it? What should I be able to see with this?
It's fine for the money....
You wouldn't find a cheaper 70mm scope with a standard 1 1/4"focuser and Plossl eyepieces and a mount included.
I have two Skywatcher scopes and I'm quite happy with them.
It isn't really sharp but you pay a lot of money for good performance in a telescope and the Greatstart will still show you loads of objects in the sky for a really good price.....the satellites of Jupiter, Saturn's rings when they open up a bit...they're nearly edge on at the moment so we're not getting a good view of them...and lots of star clusters and galaxies.
You can get more eyepieces for it but don't expect really sharp views at more than around 60x power. That's still enough to see lots of stuff and you can use a bit more power but the image will be getting a bit dim and not so sharp. Plenty of light from the Moon and the brighter planets but it's easy to expect too much from telescopes.
Smaller scopes are great for wide field low power views and you'll get good views of the star fields of the Milky Way at around 40x or less. Try looking around Cygnus for some really good star fields Sometimes low powers give more impressive views than high powers. The image is brighter and you get a wider field of view.
You get planetarium software with the scope so you'll be able to find out where all the good stuff is quite easily.
One you can download for free is Stellarium.
It's very good.
http://www.stellarium.org/ . . . .
Here's a bit about the Greatstart 70mm scope.
http://www.optcorp.com/product.aspx?pid=12371 . . . .
Have fun.
Refractor Telescopes
Why good telescopes are expensive?
I just saw a good refractor telescope costs about US$ 6,000.
I was wondering what makes it cost so much.
forget the computer tracking system, then it is all about the lens?
Just build your own=
http://www.youtube.com/watch?v=YbdxcoMATOo
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Can a refractor telescope using three lenses be constructed.?
like i have an achromatic lens of 2" dia and a focal ratio f/10 and another spare singlet of 6" focal length along with a great eyepiece....i constructed a simple scope using the first lens and the eyepiece... is it possible to add another lens in the middle,or make another telescope using 3 lenses ..?? any changes in the FOV and magnification of the scope,if built...?? any links and support will be helpful..
The spacing of the lenses and the material they are made of ( flint, crown ) is critical to the elimination of aberration. You can find surplus achromat lenses to make scopes from at Edmunds for a good price
Refractor Telescopes
What is the difference between refractor and reflector telescope?
The two types of telescopes are quite simple to tell apart. Refractor Telescopes use lenses, much like your regular eye glasses. Reflector Telescopes use mirrors. Both are very great tools for viewing space, but there are some key differences.
Refractor telescopes are almost always very long and slender in size and shape. The eyepieces is always at the bottom of the telescope, putting your view straight through the lenses that are place on the back and front of the telescope.
Whereas reflector telescopes are usually quite fat and short, much like a large soda can. The eyepiece is placed toward the front (or top) of the telescope and a mirror is used to reflect the image sideways out of the telescope, through an eyepiece and into your eye.
There has always been a debate as to which telescope is better. Many refractor telescope enthusiasts would try to sell you that reflector telescopes are always shoddy and poorly made. While this may have some truth to it, reflector telescopes have some large benefits over refractors.
One common benefit that reflector telescopes have over their refractor counterpart is on the issue of focus. Refractor telescopes (lens-based scopes) have a tendency to not blend colors as easily. If we were to sharpen the focus on a blue color, the red colors would most likely fall out of focus. This may not have a large effect on your amateur astronomy experience, but at some point you might run into this issue.
Reflecting telescopes do a better job at keeping all of the colors together and in focus. But you might pay an extra buck for bang, so to speak.
Obviously, you might find packing your reflector telescope around a bit more of a task than your refractor, but to some astronomy enthusiasts the extra weight is worth the effort. If you need the extra car space for camping gear and you don’t plan to spend too much time stargazing, then a nice small refractor telescope might serve you better.
If you’re ready for a more expensive telescope that can bring all of your colors into focus, then a reflecting telescope is going to suit you will, but you might pay and extra buck or two for it. Stargazing is still a new hobby for you, a refractor telescope will suit you just fine.
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whats best for long distance terrain surveilance, refractor, casigrien telescopes or binoculars?
I MEAN WHICH ONE HAS THE MOST POWERFUL MAGNIFICATION?
Powerful magnification isn't necessarily the "best" for long distance surveillance. It depends entirely upon it's use. If you are wanting to see planets and stars and other celestial objects in their true color with as much detail as possible, a good reflecting telescope is the best. If you're trying to peek in the window of the girl down the street, get cable.
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Refractor Telescope Astromony
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Astronomical Refractor
If a 8-inch reflector telescope has a focal length of 200 cm and the eye-piece has a focal length of 2.5 cm?
and the magnification is 80x and a 4-inch refractor has a focal length of 256 cm and the eye-piece used for observing has a focal length of 1.5 cm and has a magnification of 170x.
Which telescope do you prefer for astronomical observations and why?
And which telescope should you consider for your nightly observing sessions and why?
What an odd pair of telescopes! I've been active in astronomy for over 50 years and have never ever seen telescopes with focal lengths as long as these. 8-inch reflectors typically have focal lengths of about 1000 to 1200 mm and 4-inch refractors typically 900 to 1500 mm. Anyway, given these options, I'd choose the 8-inch reflector because of its larger aperture and shorter focal length. Even so, I'd probably need to use a stepladder to get to the eyepiece. Where did you get these crazy specifications?
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