TeleVue Tele Vue-NP127fli Operating Manual

680mm f/5.3 imaging system 4-element apo astrograph

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Operating Guide

680mm f/5.3 IMAGING SYSTEM

Thank you for purchasing the Tele Vue-NP127fli. 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. 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 and wide, 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

subsequent SDF and Tele Vue-101 versions at f/5.4 brought us even closer to perfection. Maintaining

this fast 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 20 year refinement

toward perfection with the Nagler-Petzval 101, and NP127 with an even faster f/5.2 speed.

The Tele Vue-NP127fli is Tele Vue's first dedicated imaging instrument. It was developed in collabo-

ration with Finger Lakes Instrumentation to provide you with, what we hope you will agree, is the easiest,

most carefree imaging setup you've ever used. The NP127is optics plus Large Field Corrector produce

an f/5.3 system that mates beautifully with the variety of CCD chips available in FLI's Proline camera

series. The Atlas focuser with its incredible resolution of 85nm/step is also ideally matched to our optical

system. The patented Zero Tilt Adapter system ensures all components lock squarely together, while the

unique end-plate tilting feature allows for any final adjustment that might be necessary.

Tele Vue

V i s i o n a r y

4-ELEMENT APO ASTROGRAPH

32 Elkay Dr., Chester, New York 10918 (845) 469-4551.

televue.com

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Page 1 4-ELEMENT APO ASTROGRAPH Thank you for purchasing the Tele Vue-NP127fli. 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 2: Optical Tube Assembly
Mounting retracted position Hardware 1.0 Getting Acquainted with the Tele Vue-NP127fli 1.1 Optical tube assembly The NP optical design contains four elements consisting of two widely spaced, air-spaced doublet groups. The forward group of lenses are contained in a stainless steel lens cell. The cell attaches to the main tube via three alignment screws.
Page 3 3.0 Caring for your NP127fli The Tele Vue-NP127fli 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 4 Collimation of your Tele Vue-NP127fli has been locked at the factory. With reasonable care it will remain aligned. However, rough handling can cause misalignment. WARNING: Do not loosen the but- ton head screws in the front or rear lens cells as this will cause misalignment. If necessary, contact Tele Vue for re-collimation.