Tele Vue NP101is APO - 4" f/5.4 Imaging System Refractor Telescope

Free Shipping

More Views

Tele Vue NP101is APO - 4" f/5.4 Imaging System Refractor Telescope
$3,894.01
Item # TE-NPI-4057
OR
  • The TeleVue NP-101is is a fast scope which delivers exemplary wide field and planetary visual capability.
  • Added features to make imaging easier and more flexible.
  • New draw tube design on the TeleVue NP-101is permits quick change from visual to imaging operation and allows full camera rotation without focus change.
  • Larger rear lens groups absolutely minimize vignetting in formats up to 50mm diagonal.
Description

Details

Televue NP101is Imaging System

For 30 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 and selected it as the test instrument for its landmark review of the SBIG STL11000 CCD camera . 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.

TeleVue was 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.

Next, to take full advantage of the larger lenses, Televue developed a larger focuser and draw tube having a 3" front aperture and 2.4" rear aperture. This eliminates any restriction of the larger diameter converging light cone. They build and test the rack and pinion focuser to hold 12 lbs. of weight, yet still permit extremely fine focusing control via a 10:1 dual speed pinion assembly. 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 10:1 dual speed focuser custom designed by Starlight Instruments 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 optional Focusmaster Computer Interface.

Televue NP101is Imaging System Features

  • Dual speed knobs are on the right side of the telescope only, the 1:1 left side knob is the classic 5-hole Tele Vue style.
  • All knobs have knurled rubber grip rings
  • New draw tube also permits quick change from visual to imaging operation and allows full camera rotation without focus change.
  • As perfect as possible for imaging up to 50mm diagonal chips without penalty to its near ideal visual operation.
  • Larger focuser and draw tube having a 3" front aperture and 2.4" rear aperture.
  • Insert 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.
TeleVue Product Number: NPI-4057

All Televue products are available to ship world-wide from OPT, and are covered by a Five Year Worldwide Limited Product Warranty! Always be sure to save your original packaging materials should you need to return any Televue product for warranty or repair.
Additional Information

Additional Information

SKU TE-NPI-4057
Manufacturer Tele Vue
Telescope Series Tele Vue NP
Optical Design Refractor - Apochromatic
Mount Type None - Optical Tube Only
Warranty 5 Year Warranty
Telescope Aperture 4"
Telescope Focal Length 540mm
Telescope Focal Ratio f/5.4
Optical Coatings Fully Multi-Coated
Highest Useful Magnification 250x
Limiting Stellar Magnitude 12.8
Tube Color or Finish Televue Ivory
Optical Tube Outer Diameter Not supplied by manufacturer
Length of Optical Tube 25.5"
Optical Tube Weight 10.65 lbs.
Dew Shield Included? Yes
Dew Shield Outside Diameter Not supplied by manufacturer
Finder Included None
Diagonal Included? No - Sold Separately
Eyepiece(s) Included None
Case Included? Yes
Reviews

Customer Reviews 1 item(s)

The Televue 101is
TV101is a top Refractor could not get better for the size very sharp easy to focus and
it takes beautiful images purchased 3 months ago Review by WILLIK / (Posted on 12/13/2014)
Included Items

Included Items

  • NP-101is APO Refractor OTA
  • Enlarged focuser with 3" entrance aperture and 2.4" exit aperture
  • Focuser body has brass clamp ring with 2-lock knobs
  • Accessory end-ring with tilt capability and 4-lock knobs
  • Imaging insert threaded for Imaging System components.
  • 2" accessory insert for visual or other 2" accessories
  • Focusmate dual-speed focuser 10:1
  • Sliding metal dew shield
  • Screw-on metal lens cover
  • Hard-shell carry case
Questions & Answers

Product Questions

No questions yet. Be the first to ask the question!
Support / Downloads
Related Blog Posts