Question on Telescopes?, page
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reply posted on 1-10-2008 @ 05:43 PM by timelike
Hello Emmy!

Originally posted by emmy
For mainly all you Brits.

I'm a british astronomer! I have a magnificent 8 inch Skywatcher telescope set up permenantely in my observatory here in UK.

Originally posted by emmy
My dad and I are getting a telescope, going 50/50, but what's a good one under £100? I've been looking on Amazon and found a really good one for £102 (with P&P), apparantly the scoop on this one says you can see Mars clealy, Jupiter with its rings etc...

Now I don't want to be a killjoy but great care must be taken when buying a telescope. The sad fact is that there is no decent cheap telescope on the Market. A 60mm refractor or 4inch reflector is large enough to show you the craters on the Moon, the polar ice caps of Mars, at least three belts on Jupiter nad the rings of Saturn, but you must bare inb mind that they will be nothing like the images in magazines.

Mars in particular is very small for most of the time and you need a telescope of at least 6'' to do it justice. It might be wiser to invest in a pair of binoculars first. These will also show you the moons of Jupiter and craters of the Moon, many coloured double stars and so on. If you decide you really want to make a hobby out of astronomy then you can perhaps go on to buy something larger.

If you're keen to get a telescope then Meade, Skywatcher, Orion I think are the most reliable telescopes so far.

When you're buying a telescope you must also consider the mount. A telescope with a flimsy mount is next to useless- one slight breeze and it will quiver and the image in the eyepiece will dabce about alarmingly! There are basically two types of mount:
(i). Azimuth which is your basic tripod. Remember that the stars in the sky are constantly moving as the Earth rotates and any image which is magnified by 100x or more will make this drift very apparent. Unfortunately that's the down side of this type of mount, although admitedly this type of mount is easy to set.

(ii) Equatorial mount. This is the best type of mount- it is aligned with the Earth's pole so that you only have to worry about one direction of rotation. Indeed many such mounts can have motors attatched to them so thaqt they can track an object in the sky- essentially the motors drive the telescope so it moves at the same rate as the Earth's rotation.

Finally, never buy a telescope which is promoted by it's magnification alone! Many small telescopes are sold with adverts promising 500x magnification, while you could get this type of power the image will be so blurred and faint you won't be able to see anything! A good rule of thumb is that the highest power a telescope will bear is twice the aperture size(mm). Thus a 50mm telescope will give 100x, 300mm gives 600x and so on.
Originally posted by emmy
So, just wondered who has one and good plazes other than amazon.com, ta!

Emmy


A good place to go is
Stargazers Lounge
You will find pleanty of people there to help and much advice on the subject of telescope buying.

You will find astronomy the most rewarding of hobbies. Let me know how you get on.

Paul.


reply posted on 1-10-2008 @ 05:45 PM by timelike
reply to post by buddhasystem



Indeed! The telescope itself will be as steady as a jelly!


reply posted on 20-10-2008 @ 12:44 PM by zombiemann
I have a celestron starhopper 6" on a dobsonian mount. The starhopper series has been discontinued but Orion telescopes has an equivalent. Its the XCT series I think. One thing to bear in mind when looking at a scope: its not the power that gives you good views, its the light gathering.

When you do finally buy a scope, take the time to learn it inside and out before you take it out in the field. Learn how to collimate it (align the lenses and mirrors). This will make a HUGE difference in what you can see. If you don't know how to use it, all the money in the world wont make your experience any better.

A brief note on the size of the scope. To the gentleman who claimed you couldn't see much with anything less than 8": I beg to differ. There are many wonderful objects that can be viewed through a smaller scope. Charles Messier himself used a scope that had the capabilities of today's 3" scopes. And his catalog of observable objects is a foundation for amateur astronomers everywhere.

Also remember that location plays a huge role in observing as well. The university in my town has a 20" compound telescope that is practically useless at its current location. There is simply to much sky glow sound the campus to make it worthwhile. A few weeks ago the astronomy club I am part of hosted a large open session and we were joined by several astrophysics students from the university. They were amazed at what I was able to do with my small primitive (no guidance systems) scope compared to all of their fancy equipment. Because they never bother to pack up their Meade LX-200s with the fancy computers and drive 10 miles out of town to get away from the light pollution.
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