When selecting eyepieces for a telescope, consider several factors to enhance your viewing experience. First, identify the purpose, whether it’s for detailed planetary observation, something broader like lunar viewing, or deep-sky observation of galaxies and nebulae. The focal length of the eyepiece determines magnification, calculated by dividing the telescope’s focal length by the eyepiece’s focal length. It’s prudent to have various eyepieces to cover high, medium, and low magnification needs, typically ranging from 4mm to 40mm. Also, understand the importance of apparent field of view (AFOV): a wider AFOV provides more expansive views. Consider the type of eyepiece lens design like Plössl for its versatility and affordability, or ultra-wide angle designs like Naglers. Comfort features such as eye relief, particularly if you wear glasses, and compatibility with your telescope’s focuser size (1.25-inch or 2-inch) are critical. Investing in quality eyepieces can significantly improve your stargazing experience by providing clearer and brighter views.