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Alstar 1.25 inch Telescope Zoom Eyepiece - 7 to 21mm Zoom Lens Telescope Eyepiece Multi-Coated Optics Variable Magnification Compatible with Telescopes Filter Threads for Viewing Planets Nebulae

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$48.99

$ 25 .99 $25.99

In Stock

About this item

  • Seamless Magnification Control: A simple twist of the zoom housing adjusts focal length from 7mm to 21mm; Ideal for planetary clusters, lunar details, and deep-sky nebulae observation
  • Extended Eye Relief for Eyeglass Users: 16 to 33 mm adjustable eye relief accommodates eyeglass wearers with zero vignetting; Foldable soft-rubber eyecup ensures comfortable viewing at all focal lengths
  • Versatile for All Observers: Wide 30 degree to 43 degree apparent field of view adapts to planetary and deep-sky targets. Precision stepless zoom mechanism outperforms fixed focal length eyepieces
  • Premium Multi-Coated Optics: Premium 7-element 4-group high-index optical system with multi-layer anti-reflection coatings delivers sharp high-contrast celestial views; Blackened lens edges and precision anti-reflective threading eliminate stray light interference for vivid astrophotography
  • 1.25 inch Zoom Eyepiece: Enabling the observation of both the Pleiades star cluster and lunar craters rubber traction ring ensures a good grip Additionally the 1.25 inch barrel is threaded for compatibility with filters



Product Description

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The Highlights At a Glance:

The Highlights At a Glance:

  • The Explorer II Zoom eyepiece lets you change magnification power without physically changing eyepieces.
  • A twist of the zoom eyepiece housing changes focal length from 7mm to 21mm, providing a variety of viewing magnification powers.
  • Eyepiece consists of four elements which are fully coated with anti-reflection coatings for clear, contrasty views.
  • Exceptionally long 16mm-to-33mm eye relief range allows eyeglass wearers to enjoy the entire view while still wearing their corrective lenses without vignetting.

Why Do We Love What We Do?

As a worker engaged in the sales of optical products, we do think that optical products are practical and educational. It connects people with the world, not just for a small part of a people, but for everyone. Alstar leads us to a more beautiful world which we usually can’t see and we want to bring this beauty to everyone, that is why we are here.

Main Features:

  • 16mm-to-33mm Eye Relief Range
  • Can Be Used With the Eyepiece
  • Fully Multicoated Optics
  • Focal Length of 7 to 21 Millimeters

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Fully Multi-coated Optics

Optical coating technology reduces light reflection and refraction. In this way, the eyepieces ensure optimal transmission. It can provide bright, clear and high contrast images even in low light conditions.

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Safety Groove

This eyepiece has a sleek silver barrel with safety undercut, which is help to reduce the possibility of the eyepiece slipping out of the focuser or diagonal, no need to worry about it when you use it.

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Non Slip Rubber Ring

The anti-skid rubber traction ring design can increase the friction, so that it is easy to grasp and not easy to slip off.

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Blackened Lens Edges

Lens edges is blackened to reduce the scattering of stray light and maximize the contrast; designed to enhance the functionality and pleasure of using your telescope, which is conducive to planetary observation.

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Now Even the Casual Telescope User can Enjoy the Benefits of Zoom Eyepiece Technology

A twist of the affordable Explorer II Zoom housing changes the focal length from 7mm to 21mm, or to any focal length in between. That makes it ideal for locating an object at low magnification, then zooming in at higher magnifications for closer inspection. Without changing eyepieces!

Specifications:

Focal Length (mm): 7 (Zoom Spans 7-21)
Apparent Field of View ( °) 43(Sector 30-43)
Eye Relief (mm) 33 (Sector 16-33)
Number of Lenses 4
Connection (to the telescope) 1.25"
Coating of Optical System Multiple
Filter Thread Yes
Adjustable Eyepiece Cup Yes (folding)
Series Zoom
Type Eyepiece

Mike F.
2025-01-21 17:02:59
Works as described. Worth the money.
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