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TeleVue TV-NP101is Quadruplet APO Refractor Telescope

TeleVue TV-NP101is Quadruplet APO Refractor Telescope
TeleVue TV-NP101is Quadruplet APO Refractor Telescope
TeleVue TV-NP101is Quadruplet APO Refractor Telescope
Ask About Stock
TeleVue TV-NP101is Quadruplet APO Refractor Telescope
TeleVue TV-NP101is Quadruplet APO Refractor Telescope
TeleVue TV-NP101is Quadruplet APO Refractor Telescope
TeleVue TV-NP101is Quadruplet APO Refractor Telescope
Ex Tax: £3,749.17
  • Stock: Ask About Stock
  • Model: NPI-4057
  • Shipping Weight: 15.00kg
  • SKU: NPI-4057
  • GTIN: 0702403409519
  • MPN: NPI-4057
  • Location: E21

TeleVue TV-NP101is Quadruplet APO Refractor Telescope

101mm, f/5.4 APO (Nagler-Petzval) Refractor - Imaging/Visual.

Based on exemplary wide field and planetary visual scopes with added features to make imaging easier and more flexible.


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, NP101, and NP127 retain the exemplary wide field and planetary visual capability while adding new features to make imaging easier and more flexible.

Tele Vue-NP101is
Tele Vue-NP127is

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.

Imaging System scope...
Imaging System scope with DSLR camera on Vixen Sphinx mount. Accessories shown include Focusmate Driver and Digital Indicator Kit.

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.

Next, to take full advantage of the larger lenses, we 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. We 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 three 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. (Reviewer Note.)

The Focusmate 10:1 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".

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. (Reviewer Note.)

Related Links

Tele Vue-NP101is Operating Guide 
Tele Vue-NP127is Operating Guide 
Tele Vue Eyepieces for Tele Vue Refractors

TV – NP101is
TypeAPO (Nagler-Petzval) Refractor
(Elements/Groups: 4/2)
Objective (mm)101
Focal Length (mm)540
Focal Ratio (f/#)5.4
Length OTA (inch)25.5
Length with diagonal (inch)28.5
Weight OTA/Std. Config (lbs)10.7 / 10.7
Drawtube/Focuser2.4-inch, Focusmate dual-speed rack/pinion
Maximum Visual Field (deg.)4.9 (with 2-inch 55mm Plössl)
Maximum Recommended Power (x)250
Tele Vue Eyepiece PerformanceView Eyepiece Chart
Included Accessories
TV - NP127is & TV - NP101is
  • 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 3-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
Recommended Accessories
TVP-4058: NP101is Accessory Pkg.
Aperture (mm)85
Focal Length (mm)600
Focal Ratio f/7
General Information
Weight in Kg6

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