A good Plössl eyepiece outperforms a simple Kellner. Nevertheless, the features are quite impressive.
The 6.3 mm Plössl is a powerful eyepiece for the high magnification range, mainly used for moon and planets.
Areas of application of Plössl eyepieces:
Through the four-element design, the Plössl is a true all-rouder. It does not introduce an additional chromatic aberration to the system, in opposite to more simple eyepieces with fewer elements. As a consequence, these eyepieces can be very well used for observing moon and planets with higher magnifications.
At lower magnifications, Plössl eyepieces are well suited for observing nebulae, star clusters and galaxies, they convince with a field of view relatively free of distortion.
Astrophotographers can also work well with Plössl eyepieces, as they are well suited for eyepiece projection. The MgF2 coating prevents disturbing reflections and provide good contrast.
