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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. 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.
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
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Related Manuals for TeleVue NP101is
Summary of Contents for TeleVue NP101is
- Page 1 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.
- Page 2 1.2 Focuser The 2.4” output side of the NP101is focuser is designed to pass all of the field rays exiting the rear ele- ments of the objective, as the forward end of the draw tube has a 3” internal diameter. A larger focuser, therefore, lends no additional illumination benefit.
- Page 3 1.3 Case When opening the case, we recommend always lifting the lid while holding the handle. The lid opens a full 180° Optional Accessories Shown and holding the handle will give you a better grasp to insure that the lid doesn’t slip out of your hand. The interior of the case was designed to store your scope with the optional Starbeam, Focusmate Motor Driver and Digital Indicator Kit installed.
- Page 4 2” accessory adapter. 3.1 Eyepieces With its highly corrected wide, flat field and fast f/ratio, the NP101is puts eyepieces to the test. This scope demonstrates the superiority of Tele Vue eyepiece performance and, with a range of 10x to 270x (if the atmosphere allows) there is a magnification for all purposes.
- Page 5 4.0 Photographic Set Up and the Tele Vue Imaging System Tele Vue Imaging System Accessories provide solid threaded connections between components. To use these accessories requires the insertion of the Imaging System Adapter (ISA) into the focuser. You will find the ISA in the accessory compartment in the lid of the telescopes case.
- Page 6 G. AFT-1105 48mm Filter adapter Focuser Features H. AD2-1110 Apogee U47 D2/Yankee Robotic A. Large Focuser for NP101is and NP127is adapter Standard features (A) include: J. STL-1071 SBIG STL series adapter •Drawtube with 3” entrance aperture, 2.4” exit aperture •End-ring with tilt capability K.
- Page 7 E. LCL-1069 Large Field Corrector for optimized edge R. TLC-0500 0.500” long threaded extension T. TLD-1000 1.000” long threaded extension performance on NP101is and NP127is (for big chip sizes). F. NPR-1073 0.8X Reducer O. TLA-0250 0.25” long threaded extension J. STL-1071 SBIG STL series adapter K.
- Page 8 1. Prime focus for APS and smaller size chips in cameras with 55mm chip to T-Ring distance. 2. Prime focus with 0.8X Reducer for APS and smaller size chips in cameras with 55mm chip to T-Ring distance. 3. Prime focus with SBIG STL series cameras 4.
- Page 9 Prime focus photography involves attaching a camera, without its lens, to the telescope. In this method the telescope becomes the camera’s lens. In the case of the NP101is, it is a 540mm focal length, f/5.4 telephoto. It is the focal length of the telescope in combination with the diagonal dimension of the CCD chip or film frame that will determine the amount of field your photograph will cover.
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Page 10: Additional Accessories
6.0 Caring for your NP101is Tele Vue-NP101is requires no special care. Treat it as you would any fine camera lens. Use the lens cap when the telescope is being stored or not in use. The captive dew shield provides protection from glare, helps protect the lens from dust or spray blown in by the wind and minimizes dew formation on the lens. -
Page 11: Warranty
7.0 Warranty Tele Vue telescopes are warranted to be free of manufacturing or workmanship defects for 5 (five) years from the date of purchase, to the original owner. Please return the warranty card as validation of your ownership and for easy identification. If your Tele Vue telescope requires warranty service, please call Tele Vue to discuss the problem, upon which you will receive a return authorization. - Page 12 Tele Vue recommends choosing low and medium power eyepieces in ratios of field stop diameters. For example, factors of 1.4 or 2.0. When choosing higher power eyepieces, use ratios of magnification. Tele Vue-NP101/NP101is Focal True Exit Apparent Field Stop Dia.