Plössl eyepiece

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A design of eyepiece, similar to a Kellner or achromatic Ramsden but with a two-element field lens. Aberrations, particularly astigmatism, are less than with the Kellner, and it gives good eye relief. Plössls will give good performance even with telescopes having a focal ratio as short as f/4. The design was invented in 1860 by the Austrian optician (Georg) Simon Plössl (1794–1868).

Subjects: Astronomy and Astrophysics.

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