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TeleVue TV-NP101is Apochromatic Refractor Telescope


$4267.00

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SKU: NPI-4057
Manufacturer: TeleVue
Telescope Type: Apochromatic Refractor
Aperture (in.): 4 inches
Aperture (mm): 101 mm
Focal Ratio: f/5.4
Focal Length: 540 mm
Limiting Visual Magnitude: 12.6
Accepts 2-inch Eyepieces: Yes
Focuser Type: Dual-speed rack and pinion
Focuser Size: 2.4-inch
Star Diagonal: None
Weight Fully Assembled: 10.7 lbs.

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The TeleVue NP-101is "imaging system" telescope includes a larger focuser and rear lens group to illuminate large CCD cameras fully. 

Having set out to make the NP "imaging system" telescopes optically, mechanically and functionally as perfect as possible, TeleVue has certainly achieved it with this 4-inch refractor telescope.

About the TeleVue Refractor Telescope

Both the NP101is 4” refractor telescope and the 127is were specifically designed for imaging with up to 50mm diagonal chips without penalty to their near ideal visual operation. As the name implies, these "imaging system" telescopes offer a threaded focuser drawtube output that mates with a series of dedicated accessories. These accessories allow you to configure an imaging train with completely threaded connections, providing a connection that is both secure and square to the optical axis.

The NP101is maintains the optical specifications of the standard NP101 while offering a redesigned 4-element optical system. A larger rear lens group absolutely minimizes vignetting in camera 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.

A larger focuser and draw tube having a 3" front aperture and 2.4" rear aperture have been added to take advantage of the larger rear lens group. This eliminates any restriction of the larger diameter converging light cone. The rack and pinion focuser is built and tested 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 inches.

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 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". The Focusmate Driver can be remotely computer controlled with Focusmaster Computer Interface.

If you’re interested in purchasing the TeleVue TV-NP101is Apo Refractor Telescope for yourself, you can find this and many other Apo Refractor telescopes at Skies Unlimited. We carry the product in-store and online, so browse our catalog today and discover our free shipping options.

Learn More About Telescope Bundles

Have questions about the NP101is’ specifications? Call Skies Unlimited today to speak with a representative on staff. Each of our staff members is equipped with vast personal and professional knowledge in astronomy and can help you by answering any questions you may have about our products. From advice to specification information, we’re here to help!

For those who are new to the telescope-buying process and are unsure about what to look for, we can help you, too. Call or visit Skies Unlimited today just outside of Pottstown, PA at our store location. We’ll discuss your needs with you and identify the best options for your requirements, preferences and skill level.


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