|TeleVue.com: Telescopes > Tele Vue-NP101 > Reviews|
Excerpt from Star Ware, 4th ed, by Philip Harrington
The NP-101's four-element objective lens system offers exceptional false- color suppression, with nothing but pure starlight seen around Vega, Sirius, and other bright stars that really test a telescope's state of apochromatism. The Nagler-Petzval multi element objective is also designed to produce pinpoint star images right across the full field of view, whether through wide- field eyepieces or on images. Star tests show no sign of spherical aberration, astigmatism, or any other flaw that could dampen image quality in the slightest. No doubt about it, Nagler has done it again. The NP-101 is an amazing optical accomplishment, setting the bar by which all other apochromatic refractors are judged.
Excerpts from TVNP-101 review by Jeff Kramer on Excelsis.com
- This scope is superb. It has a perfect star test and virtually perfect color correction. I cannot see any color on Vega at 300x and I was really looking for it in my tests of this scope.
- As for mechanics, this scope is built like a tank. It is very solid. The focuser is smooth as silk and the satin like finish to the focuser, dewcap, and tube ring are very impressive. This scope is as nice to look at as it is to look through. ... . The hard case is very strong and it is nice to see that Televue includes such a high quality hard case with this scope when other companies charge several hundred dollars for one.
Excerpt from Premium Refractors: Having It All by Alan Dyer, from May 2002 issue of Sky & Telescope
Great optics are easy to evaluate — the NP 101 showed no sign of any aberrations, period. End of review! But to elaborate — under a star test at high power I saw no color, no astigmatism, no spherical aberration, not even any asymmetry in extrafocal patterns from sphero-chromatism. Bright stars appeared as clean, white disks right through focus, with no magenta or cyan fringing inside or outside of focus. In focus, stars appeared as tight, sharp Airy disks, surrounded by a subtle inner diffraction ring and no spurious fuzz — a textbook-perfect pattern.— Dyer, A. "Premium Refractors: Having It All". Sky & Telescope (May 2002). Read More.
Excerpt from Sky & Telescope's Hot Product Award citation
[I]n addition to being a color-free 101-millimeter (4-inch) f/5.4 refractor, this is the culmination of designer Al Nagler's two-decade quest for a "space walk" view of the heavens. Using exotic glasses and a four-element lens system, the NP101 produces pinpoint star images across a large, flat field. Fitted with a 31-mm Nagler Type 5 eyepiece, this scope pumps all the starlight from a 4 1/2 degree field of view into an exit pupil 5 3/4 mm across, thus offering an exceptionally rich-field view of the sky.— "Step Into The Sky". Sky & Telescope (Dec. 2001).