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Never have novice stargazers been presented with such a vast array of telescopes and accessories to pursue their hobby.

Naturally, this brings the burden of choice: the bewildering variety makes it hard for an uninformed consumer to make the right decision on what type of telescope to buy.

Simply divide the focal length of the scope by that of the eyepiece; that's the magnification.

For instance a 1,000-mm focal length scope, used with a 25-mm eyepiece, delivers 1,000 / 25 = 40 power (or 40x).

The emphasis would probably be a bit different if it were written today, though; in particular, Go To drives have become much cheaper, better, and easier to use over the last decade.

First we'll explore the types of telescopes available, and then we'll discuss their key features — the size of the primary lens or mirror, type of mount, portability, computerization, and accessories. Answer these key questions, familiarize yourself with what's on the market, and you'll be well on your way to choosing a telescope that will satisfy you for many years to come.

Just as enlarging a photograph too much will simply show you the grain in the film or the pixels on the chip, so too will excess magnification just make your target blurry. There's a simple rule to find the top useful magnification: 50 times your telescope's aperture in inches, or twice its aperture in millimeters.

And that's if the scope has perfect optics and the night air happens to be unusually steady.

Now you know the maximum practical power for any given instrument. What do those little numbers on the eyepieces tell you about the magnification they give?

Every scope has a focal length, which is effectively the distance from the primary lens or mirror to the image it forms.

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