Tele Vue NP101is - 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 IMAGING SYSTEM
4-ELEMENT APO REFRACTOR
Thank you for purchasing the Tele Vue-NP101is. It has been our pleasure to craft this fine instrument for
you. Thirty 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 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 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 in this, the ideal form culminating the 30-year refinement toward perfection with
the Nagler-Petzval 101. Al’s “spacewalk” dream from his 1960’s NASA simulator days is yours to live.
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 NP101is maintains all the
visual prowess of the standard NP101, 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 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.
Tele Vue-
NP101
®
is
Operating Guide
Lens Cap
Optical Tube Assembly
Case
2” Accessory Adapter (left)
Imaging System Adapter (right)
Standard Features - Optical tube assembly includes: captive sliding dew shield, 2.4” focuser with 10:1
Focusmate 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.