Tele Vue NP101 - Manual

32 Elkay Dr., Chester, New York 10918 (845) 469-4551. televue.com
Tele Vue
®
V i s i o n a r y
540mm f/5.4
4-ELEMENT APO REFRACTOR
Thank you for purchasing the Tele Vue-NP101. It has been our pleasure to craft this fine instrument for
you. Though instructions for use are as simple as mounting the scope, removing the lens cover, and
inserting an eyepiece, please take a moment to review the information here.
Thirty-plus years ago Al Nagler took Petzval’s portrait lens concept using widely spaced doublets,
and patented a fast telescope design version for the purpose of testing eyepieces. The 5” f/4 MPT
(Multi-Purpose Telescope) with its fast speed, wide and flat field, led to a series of continuous improve-
ments, primarily in color correction. The “Halley Commemorative,” 4” f/5.5 started the parade where
more advanced glasses including special dispersion, fluorite and fluorite substitute glasses brought steady
improvements. The 4” f/5 Genesis employed fluorite in the rear doublet and the SDF version at f/5.4
and subsequent Tele Vue-101 version brought us closer to perfection. Maintaining the f/5.4 speed while
reducing tube length in a totally new design, with new glasses allowed virtually ideal color correction and
improved field flatness. The NP101 (Nagler-Petzval) is the ultimate culmination of 30-years of refinement
toward optical perfection. Al’s “spacewalk” dream from his 1960’s NASA simulator days is yours to live.
Bon Voyage!
WARNING: NEVER try to look at the sun or point the telescope toward or near the sun without
professional solar observing equipment rigidly secured in front of the objective lens. When
observing the sun with the proper filters, use only the Tele Vue “Sol-Searcher” (SSF-1006) for
finding the Sun. Remove any finding devices such as Starbeam from the telescope. Instant and
permanent eye damage may result from viewing the sun directly, even during a solar eclipse, or when
viewing through thin clouds, or when the sun is near the horizon.
Standard Features - sliding dew shield, screw-on lens cover, 2” focuser with 10:1 reduction, 2” Everbrite
diagonal, 2” to 1¼” adapter, ring mount and custom hard-shell case.
Mounting - For attaching the Tele Vue-NP101 to any Tele Vue mount, you will receive the two ¼-20 studs,
wing knobs, Allen wrench and complete mount assembly instructions with the mount. Tele Vue makes vari-
ous adapter plates for popular German equatorial mounts. Please consult your dealer.
Finders - We particularly recommend using the Starbeam reflex sight (part# SFT-2003), which attaches to
the Ring Mount. The telescope will fit in the case with the Starbeam attached. Movement of the mount ring
may be necessary. The Quick Release Universal Finder Bracket (QFM-1008) holds a traditional 50mm
finderscope and also attaches to the mount ring channels.
Terrestrial Viewing Considerations - The Tele Vue 55mm Plössl or 41mm Panoptic in a 2” diagonal will
provide the maximum true field of 4.9°. This can serve as a finder, for rich field viewing or for terrestrial
use. (Image is upright, but left-right reversed using diagonal mirrors.)
Tele Vue-
®
Operating Guide