A Plössl is a type of eyepiece used in telescopes and binoculars, known for its wide field of view and good optical performance. It typically consists of four glass elements arranged in two groups, which helps reduce optical aberrations and improve image clarity. Plössl eyepieces are popular among amateur astronomers for their versatility and affordability. These eyepieces are often used for both planetary and deep-sky observations, making them suitable for various astronomical applications. Their design allows for comfortable viewing, as they usually have a longer eye relief compared to simpler eyepiece designs, such as the Huygens or Kellner eyepieces.