TeleVue - TV-102iis Imaging System Optical Tube TeleVue 10% OFF Telescope Sale!!

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. 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 STL-11000 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. 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 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 is supplied standard and 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 push 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.

Features:
    * The 102iis uses the larger focuser and new features of the other new Imaging System scopes
yet still functions for regular visual and Bino-Vue operation at 1x. With the Imaging System
options available, this scope truly can do it all.
    * Think 102iis when ”back focus” is an issue. Extra back focus permits use of multiple
accessories such as filter wheels, off-axis guiders, etc.
    * Recommended for use with 35mm or smaller chips.
    * New non-restrictive 2.4” focuser with 3” input inside diameter allows maximum performance
when using RFL-4087 0.8x reducer/flattener.
    * Focusmate installed.
    * Sliding captive dew shield
    * 2” accessory adapter with clamp ring for 1x Bino Vue use, 5” long extension tube for single
use, and photographic accessory adapter are all included.
    * Custom fitted hard shell case included. 

Focuser Features...
    * Drawtube with 3” entrance aperture, 2.4” exit aperture
    * End ring with tilt capability
    * 4-Lock knobs to secure camera equipment or 2” adapter
    * Body has brass clamp ring with 2 lock knobs
    * Focusmate 6:1 dual speed focuser
    * Indexed 2” accessory adapter with brass clamp ring
    * Imaging insert threaded for imaging system components. 

Optical Design: Apochromatic Refractor
Aperture: 102mm (4”)
Limiting Visual Magnitude: 12.5
Focal Ratio: f/8.6
Focal Length: 880mm
Optical Tube Dimensions: 25.9” (with dew shield retracted)
Focuser Design: 2.4” Focuser with Focusmate