Kellner eyepiece

Kellner eyepiece

(kel -ner) See eyepiece.

Kellner eyepiece

[′kel·nər ′ī‚pēs]
(optics)
A Ramsden eyepiece with an achromatic eye lens.
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References in periodicals archive ?
Includes 8-inch f/6 optical tube assembly with 1 1/4-inch focuser, 25-millimeter Kellner eyepiece, 6 x 30 finderscope, and Astrolight Altazimuth mount.
Each scope includes a 20-mm 1 1/4-inch Kellner eyepiece.
95 with a 12-mm Kellner eyepiece and dual cross-hair reticle.
The 6-inch f/8 parabolic mirror comes with a Rigil QuickFinder, 18-mm Kellner eyepiece, rack-and- pinion focuser, and an instructional videotape, all for $379.
Rainbow Optics makes no claims for the Kellner eyepiece - which is a standard imported unit offered to observers who may not have a 1 1/4-inch ocular in their kits.
I've found, for example, that a 9-mm Kellner eyepiece produces sharp, high-power views rarely attainable in my larger reflectors.
The telescope is shipped with two Kellner eyepieces, with focal lengths of 25 and 10 mm, yielding 26x and 65x respectively.
The COSMOS 90GT WiFi Telescope comes with a StarPointer red-dot finder, 25- and 10-mm Kellner eyepieces, and a rubberized accessory tray with an angled smartphone platform.
That said, it's worth noting that the scope's long focal ratio is very forgiving of eyepiece design, and I also had very good views with much older Plossl and orthoscopic eyepieces, and even lowly Kellner eyepieces delivered pleasing views.
Two Kellner eyepieces are included: a 20-mm that yields 14x, and a 10-mm yielding 28x.