Are Plossl eyepieces any good?
Plössl eyepieces are good all-around performers, producing sharp images at the center of the field, but they have only four lens elements. Better edge correction with a short-focus telescope is one of the things you pay extra money for, and sophisticated eyepiece designs have as many as eight elements.
What is the difference between Plossl and Kellner?
Kellner eyepieces have decent eye relief, a fair field of view (45 degrees) and little curvature of field. The Plossl eyepiece is composed of two doublets, which are identical to each other. For this reason, you will also hear it called a symmetrical eyepiece.
What is a RKE eyepiece?
Kellner Eyepiece: A type of eyepiece design consisting of a plano-convex field lens and a cemented doublet lens as the eye lens.
What is Plossl?
The Plössl is an eyepiece usually consisting of two sets of doublets, designed by Georg Simon Plössl in 1860. Since the two doublets can be identical this design is sometimes called a symmetrical eyepiece. The compound Plössl lens provides a large 50° or more apparent field of view, along with relatively large FOV.
Whats a Plossl eyepiece?
Plõssl: Also known as symmetric eyepieces, they are composed of two achromats (crowns facing each other). Plössl eyepieces offer long eye-relief and a superior field of view to that of the orthoscopic. They do fall short of the orthoscopic design in distortion, however.
What’s in a Plossl eyepiece?
Steve says: “A Plössl eyepiece comprises four glass elements arranged as two back-to-back achromatic doublets; or, in other words, two pairs of two glass lenses. These eyepieces produce a ‘standard apparent feld of view’ of between 50° and 56° with most set at around 52°.
How good are zoom telescope eyepieces?
They tend to occupy the middle ground of focal length/magnification, so you may still need a very high and low magnification eyepieces (short and long focal length, respectively), but a zoom could handle everything in between for you. On the face of it, they are a fantastic tool, but nothing is perfect.