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. Over forty 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, wide and flat field, led to a series of
continuous improvements,primarily in color correction. The "Halley Commemorative," 4" f/5.5 Renaissance
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
f/5.4 SDF and subsequent Tele Vue-101 versions brought us closer to perfection, 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.
Tele Vue's "is" designation denotes instruments capable of accepting Imaging System photographic
accessories. Tele Vue has designed this series of accessories in conjunction with each optical system so
you are ensured 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 propri-
etary 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 Starbeam 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)
Optical Tube Assembly
Lens Cap
Case
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