Tele Vue NP127is, NP102is and NP101is.

Concept: CCD cameras have challenged telescope optics beyond anything ever placed at the
focal plane. I knew our APO objectives were up to the challenge, and with the proper tweaks
would be extraordinary tools for the imager. With Tele Vue Imaging System ("is") telescopes,
we have refined our instruments and optional equipment beyond anything a CCD chip has
seen.(Reviewer Note.) We started small (literally) in 2005 with the Tele Vue-60is and available
Digital Micrometer Kit. Achieving critical acclaim with the 60is, we were encouraged to further
develop "is" telescopes and accessories to maximize aperture, real field coverage and
performance, and to make the processes easier for the imager. - Al Nagler

For 25 years, Tele Vue has pushed the boundaries of APO refractors, as well as eyepieces,
to the recognized pinnacle of performance. We were gratified but not surprised that Backyard
Astronomer's Guide said of the NP101: "optics don't get any better than this." No wonder Sky
and Telescope rated the NP101 tops (May & June 2002) and selected it as the test
instrument for its landmark review of the SBIG STL11000 CCD camera (July 2004). The "is"
versions of the Tele Vue- 60, 102i, NP101 and NP127 retain the exemplary wide field and
planetary visual capability while adding new features to make imaging easier and more
flexible.

We were determined to make the NP series optically, mechanically, and functionally as
perfect as possible for imaging up to 50mm diagonal chips without penalty to its near ideal
visual operation. (Reviewer Note.) How? By applying the developments created for the Tele
Vue-60is to the new NP101is and NP127is and then going beyond.

The NP101 (540mm, f/5.4, 4") and NP127 (660mm, f/5.2, 5") maintain their optical
specifications yet with redesigned 4-element optical systems. Larger rear lens groups
absolutely minimize vignetting in formats up to 50mm diagonal. For these large chips an
optional field corrector was developed (Reviewer Note) so the corners of the newly brightened
edges would virtually be as perfect as the center of the field.

In order to take full advantage of the larger lenses, a non-vignetting focuser was developed to
prevent any restriction of the larger converging light cone. The draw tube has a 3" front
aperture and 2.4" rear aperture. This new draw tube also permits quick change from visual to
imaging operation and allows full camera rotation without focus change. In addition, it has the
capability to correct for any residual focal plane tilt and accepts a "position stop" for our
digital micrometer to allow repeatable focus measurement to 0.0001".

To maintain squareness to the optical axis while changing camera orientation, the draw tube
has four lock screws that tighten against a taper on the "imaging insert" ring. This insert is
threaded to accept Tele Vue's new Imaging System accessories including large diameter
extension tubes, optical accessories, and camera and CCD attachments, all with mating
threads.

The Focusmate 6:1 planetary ball type reduction focuser provides extremely sensitive focus
adjustment, measurable with the optional Digital Micrometer Kit to better than 1/10,000".
Also, the optional Focusmate Driver permits electronic motor control of the focusing process.
The Focusmate Driver has direction push-buttons and adjustable speed. A tap on the button
permits vibration-free focusing in steps as small as approximately 0.0005". The Focusmate
Driver can be remotely computer controlled with software under development.

Tele Vue has been known for producing visual instruments "even better than you imagined."
We aim to achieve the same with our imaging equipment. Our dedicated local machinists and
in-house staff are as committed as ever to deliver on these quality and performance goals.

Prices:
NPI-5053 Tele Vue NP127is - £6279.00
NPI-4087 Tele Vue NP102is OTA - £2597.00
NPI-4055 Tele Vue NP101is - £3561.00
TVI-2461 Tele Vue 60is OTA - £1469.00

All + £10.00 shipping & insurance.

The Astronomy Shop

1 Tone Hill. Wellington

Somerset TA21 0AU

United Kingdom

Telephone: +44 (0)1823 665510