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TeleVue NP127is Operating Manual

660mm f/5.2 imaging system 4-element apo refractor
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TELEVUE NP127is TELESCOPE
Description/overview at:
Cover Photo: Copyright Company Seven
Showroom: 14300 Cherry Lane Court
Laurel, Maryland 20707
301-953-2000
http://www.company7.com
T1175 Manual
Company Seven
Astro-Optics Division
OPERATING GUIDE
2010 PRODUCTION MODEL
Above: NP127is telescope at Company Seven
http://www.company7.com/televue/telescopes/tv127is_2010.html
Correspondence: Box 2587
Oct 2010
Montpelier, Maryland 20709-2587
info@company7.com
Page 1 of 11

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Summary of Contents for TeleVue Televue NP127is

  • Page 1 Company Seven Astro-Optics Division TELEVUE NP127is TELESCOPE OPERATING GUIDE 2010 PRODUCTION MODEL Above: NP127is telescope at Company Seven Description/overview at: http://www.company7.com/televue/telescopes/tv127is_2010.html Cover Photo: Copyright Company Seven Showroom: 14300 Cherry Lane Court Correspondence: Box 2587 Laurel, Maryland 20707 Montpelier, Maryland 20709-2587 301-953-2000 info@company7.com...
  • Page 2 Tele Vue- ® Operating Guide 660mm f/5.2 IMAGING SYSTEM 4-ELEMENT APO REFRACTOR 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.

  • Page 3: Optical Tube Assembly

    1.0 Getting Acquainted with the Tele Vue-NP127is Focuser Body Draw Tube Tension Main Tube Rear Lens Cell Draw Tube 127mm Front Lenses and Cell End Ring Lock Knob Fine Focus Focuser Pinion Assembly Dew Shield in Coarse Focus retracted position 1.1 Optical tube assembly The NP optical design contains four elements consisting of two widely spaced, air-spaced doublet groups.
  • Page 4 Imaging System Adapter or brass clamp ring within the 2” Accessory Adapter. There are two configura- tions for the lock screws: visual using four screws, and imaging using three screws. The threaded holes on top of the focuser body accept the Digital Indicator Kit. Operation of the rack and pinion focuser is via the 10:1 ratio Focusmate on the right side or either of the 1:1 knobs.
  • Page 5 call Tele Vue for recommendations. In general, we suggest 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 eye- pieces, use ratios of magnification. (See reference chart in the “Choosing Your Eyepieces” article.) 3.2 Finders We particularly recommend using the Starbeam reflex sight (part# SFT-2003), which attaches to the Tube Rings.
  • Page 6 LCL-1069 Large Field Corrector • Optimizes edge of field performance. Recommended for 35mm CCDs (43mm diagonal) and larger. NPR-1073 – 0.8x Reducer for NP and NPis series telescopes • Recommended for increasing field with APS size formats (27mm diagonal) • Constructed to fit both standard 2”...
  • Page 7 TRG-1072 – Standard T-ring adapter • This is the most restrictive of adapters as it has the smallest inside diameter. Recommended for use with APS size or smaller chips. CWT-2070 – Canon Wide T Adapter • Adapts Imaging System Accessories to Canon DSLRs. Includes Canon Bayonette mount. •...
  • Page 8 4.1 Adjustable Position End Ring The tilt of the End Ring to the optical axis can be changed to compensate for any tilt errors you may see in your photography. The telescope is aligned with the End Ring locked firmly against the end of the draw tube.
  • Page 9 5.0 Imaging System Focus Accessories All Tele Vue telescopes with rack and pinion focusers now permit the photographer to index focus position to within 0.0005” by means of a digital indicator. Mount- ing points are provided on top of the focuser body and end of the draw tube for easy installation of the various Digital Indicator Kits.

  • Page 10: 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 11 " ) ° ¼ " ¼ " ¼ " ¼ " °...