Tele Vue Paracorr Tunable Top PTT-2002 RARE 08367 USA Coma Corrector HTF 24039

Description

Description
Tele Vue Paracorr Tunable Top PTT-2002 RARE 08367 USA Coma Corrector HTF 24039
Comes in the Original Box.
What is pictured is what's included.
Please see our other listings, as we have more Tele Vue items up for sale at this time.
***From the manufactures website:
Screw-on visual adapter shown on Paracorr Photo Lens. Can be used with either the traditional Paracorr (PCR-2000) or with the new Paracorr Photo Lens Assembly for Trings (PLA-2001.)
*OPTIMIZING YOUR TELE VUE NAGLER TYPE 4 AND TYPE 5 EYEPIECES WHEN USING PARACORR'S TUNABLE TOP*
As I'm sure you know or you've read, all Newtonian/Dobsonian telescopes can benefit from using a Tele Vue Paracorr (Parabola Corrector) to eliminate coma in the image. One aspect to optimizing this correction is the distance of the eyepieces focus point (field stop location) to the last surface of the Paracorr lens (within a small +/- tolerance of course). Typical eyepieces used with fast Newtonians can have field stop locations differing by as much as half an inch. To accommodate for the differences, we developed the "Tunable Top."
The "Tunable Top" permits optimized aberration control for all Tele Vue eyepieces and many others by simply loosening a screw and rotating the Tunable Top. The eyepiece barrel height raises and lowers - allowing you to maintain the proper field stop to Paracorr lens distance. For your reference here is a recommendation guide for choosing the best setup for various Tele Vue eyepieces to get optimum correction;
TUNABLE TOP AT MAXIMUM HEIGHT USED IN 2" MODE: 20mm Nagler Type 2, 13mm Nagler, 35mm Panoptic, 27mm Panoptic, 22mm Panoptic
TUNABLE TOP AT MAXIMUM HEIGHT AND USED WITH 1.25" ADAPTER: All Radians, All Plossls, 4.8mm and 7mm Naglers, 15mm and 19mm Panoptics, Tele Vue Zoom 8-24mm
TUNABLE TOP AT MINIMUM HEIGHT AND USED IN 2" MODE: 31mm Nagler Type 5, 22mm Nagler Type 4, 17mm Nagler Type 4
TUNABLE TOP AT MINIMUM HEIGHT AND USED WITH 1.25" ADAPTER: 16mm Nagler Type 2, 12mm Nagler Type 2, 12mm Nagler Type 4, 9mm Nagler
**CAUTION: Do NOT use Barlow lenses with the Tunable Top Paracorr; the Barlow may contact the Paracorr lens.**
***
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