![]() ![]() Note that the same eyepiece used with a different focal length scope will give different powers. A 2000-mm focal length scope used with a 25-mm eyepiece will therefore deliver 2000/25 = 80 power (or 80x). To calculate the magnification, simply divide the focal length of the scope by that of the eyepiece. Eyepieces have focal lengths, too - 25- or 10-mm, for example, and thus their own magnification. This is a figure that you'll usually see printed or engraved near the eyepiece focuser and usually lies in the range of 400- to 3000-mm, depending on the aperture and type of telescope. MagnificationĮvery telescope has a stated focal length, which is effectively the distance from the primary lens or mirror to the point at which it forms an image of a very distant object. But before we examine specific eyepiece designs, here's a quick primer on the basics. ![]() What sort of telescope eyepiece, then, should you use? A casual inspection of most publications advertising optical accessories will reveal a plethora of types - almost as many varieties as telescopes, it seems! Choosing the right one for you depends on several factors: the objects you wish to observe how tolerant you are of optical imperfections whether you want narrow or wide fields of view whether or not you wear glasses and (as always) how much you are prepared to spend. What Type of Telescope Eyepiece Should You Buy? This telescope eyepiece guide is meant to help guide you to finding what you most need. When a cheap eyepiece is replaced with a quality one, observers are often astounded, to the extent that they feel as if they have a new telescope - and in a very real sense they do. It may seem like a small link in the chain, but it can make or break the optical system. Like everthing in life, you get what you pay for, but designs with desirable qualities can be found at reasonable cost once you know what to look for.Īn instrument can possess the finest objective lens or mirror, but the exquisite detail at its focus will not be faithfully conveyed to the eye or camera unless an eyepiece of equal quality is used. Eyepieces come in many sizes and designs to suit all tastes and budgets. What isn't readily appreciated by a great deal of observers is just how important good eyepieces are to scope performance. How many times have you bought an eyepiece for your telescope? Chances are you're still using the budget models supplied with your telescope. ![]()
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