TeleVue NP127is Operating Manual

Tele Vue-
Operating Guide
660mm f/5.2 IMAGING SYSTEM
Thank you for purchasing the Tele Vue-NP127is. It has been our pleasure to craft this fine instrument for you.
Nearly thirty years ago, Al Nagler received a U.S. patent for a fast, refracting telescope design based on
Josef Petzval's portrait camera lens concept. Petzval's design uses widely spaced doublets to produce a
flat focal plane over a relatively narrow field of view, just the sort of field a fast telescope can see. Nagler's
combination of flat-field, fast focal ratio, and unobstructed system lent itself perfectly for testing eyepieces.
The 5" f/4 MPT (Multi-Purpose Telescope) with its fast speed and wide, flat field, led to a series of
continuous improvements, 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
subsequent SDF and Tele Vue-101 versions at f/5.4 brought us even closer to perfection. Maintaining
this fast 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 in this, the ideal form culminating the 20 year refinement
toward perfection with the Nagler-Petzval 101, and NP127 with an even faster f/5.2 speed.
The Tele Vue-NP127is refines the original NP127 with the addition of a more robust, larger focuser
now standard with 10:1 reduction. The "is" designation denotes Imaging System, Tele Vue telescopes
with specific mechanical advantages for photography. Tele Vue offers a series of accessories in conjunc-
tion with each optical system so you are assured of compatibility and maximum performance. While the
NP127is maintains all the visual prowess of the previous NP127, the larger rear elements and larger
focuser along with a host of proprietary Imaging System accessories, make it ideally suited for the CCD
imager.
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,
remove any sighting devices such as Star-
beam from the telescope. Use only the Tele Vue Sol
Searcher to find the sun. 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 - Optical tube assembly includes:
captive sliding dew shield, 2.4" focuser with Focus-
mate 10:1 reduction, tilt adjustment end ring, screw-
on metal lens cover, 2" Accessory Adapter, Imaging
System Adapter, custom hard-shell case, Allen Keys
for end ring tilt adjustment.
Tele Vue
V i s i o n a r y
4-ELEMENT APO REFRACTOR
®
32 Elkay Dr., Chester, New York 10918 (845) 469-4551.
®
2" Accessory Adapter (left)
Imaging System Adapter (right)
1
Optical Tube Assembly
Lens Cap
Case
televue.com