TeleVue NP101is Operating Manual

Tele
Operating Guide
540mm f/5.4 IMAGING SYSTEM
Thank you for purchasing the Tele Vue-NP101is. It has been our pleasure to craft this fine instrument for
you. Over forty 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 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. 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 40-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 older NP101, the larger rear elements and larger focuser, along with a host of proprietary
Imaging System accessories, also makes 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.
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.
Tele Vue
V i s i o n a r y
Vue-NP101
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
is
televue.com