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 21mm to 7mm, 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.

For years zoom eyepieces were regarded as “convenient,” but without the optical resolution required in demanding astronomical applications. The Meade Series 4000 Zoom Eyepiece has changed that impression — completely and forever.

7 Lens 1.25" 7.2mm - 21.5mm Zoom Eyepiece.

7.2mm to 21.5mm focal length with markings of 7.2mm, 10mm, 13.5mm, and 21.5mm, 40-degree field of view at 21.5mm, 60-degree field of view at 7.2mm and comfortable 15mm eye relief.

The new Baader Hyperion 8-24mm Clickstop Zoom continues the Hyperion tradition of delivering top-of-class performance and quality, at very reasonable prices.

The Premium Zoom is an elegant and convenient alternative to using multiple telescope eyepieces of differing focal lengths to achieve views of differing magnification. With the Premium Zoom, you simply adjust the focal length up or down according to your preference, without having to remove the eyepiece from the telescope focuser. The Orion Premium Zoom Telescope Eyepiece features a focal range of 22.5mm to 7.5mm.

A William Optics high-quality zoom eyepiece with large field of view and very good correction: no more compromises for zoom eyepieces! Experience the convenience of 5 eyepieces in one at the price of half! New-design, long eye relief, wide angle eyepiece.

The PENTAX XF Zoom eyepiece provides magnification of 20x-60x (PF-65ED), 26x-78x (PF-80ED) and 32.5x-97.5x (PF-100ED), an apparent field of view of 42 to 60 degrees, and an eye relief of 11mm to 15mm. It also features a rubber eyepiece ring designed for comfortable viewing even with eyeglasses.

This high performance, high-contrast, high power eyepiece is ready to take its place among the best planetary eyepieces available... but with a "Nagler" twist. Al incorporated his proven "Nagler" concept into a zoom, while optimizing for the performance factors critical to planetary observers; contrast, resolution, and comfortable eye relief.

Tele Vue Nagler Zoom eyepiece 2mm - 4mm.

The SMC Zoom eyepiece features a magnification range of 16x-48x (PF-65ED), 20x-60x (PF-80ED) and 26x-78x (PF-100ED), an apparent field of view of 38 to 60 degrees, and an eye relief of 20mm. Like all PENTAX eyepieces, it is renowned for its outstanding image reproduction. JIS Class 6 rated waterproof and fog proof construction.