It is important to understand how telescope eyepieces actually work so you can be sure to select ones appropriate to the activity you will be using your telescope for. Every telescope utilizes a lens or a mirror and some even use both. They are used to collect incoming light and in turn outline a figure from that light. A telescope takes the figure formed by the mirror or lens (or both) and enlarges it so you can see more details in said figure.

By knowing what the markings on telescope eyepieces mean, you will able to choose lenses that meet not only your telescope's design but your particular viewing aims as well. There are simple formulas you can find online to determine the exact magnification particular eyepieces will provide. Generally you will need a couple of pieces of information (like your telescope's focal length) to determine the answer to the formula. You may even be able to find an online calculator for an automated answer to your particular lens search.

When looking for eyepieces for your first telescope, there are a few tips you can follow that may help you invest in the best lenses. You want to be sure your telescope accepts 1.25" eyepieces. Telescopes that accept two inch lenses are fine as you can find adapters relatively easily that will take the 1.25" size. Another tip is that if your scope comes with two different lenses, you are looking for one of them to generate a good low power magnification while the other generates a higher level. Generally, the best entry level eyepieces will include a 25mm focal length and a lens within the 10m to 7mm array.

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