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Lunt 7.2-21.5mm Zoom Eyepiece - 1.25"
Lunt 7.2-21.5mm Zoom Eyepiece - 1.25"
Lunt 7.2-21.5mm Zoom Eyepiece - 1.25"

Lunt 7.2-21.5mm Zoom Eyepiece - 1.25"

by Lunt Solar Systems
SKU LSS-LS7-21ZE
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
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  • 7.2mm to 21.5mm Zoom Focal Length
  • Flat-Field Optical Design
  • 0.1% Anti-Reflective Coatings
  • 1.25" Barrel Diameter
  • Optimized for Solar and Night-Sky Use
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Lunt 7.2-21.5mm Zoom Eyepiece - 1.25"

    The Lunt 7.2-21.5mm Zoom Eyepiece consolidates a full range of magnifications into a single, high-contrast optical system. Its versatile 7.2mm to 21.5mm focal length range fits any standard 1.25" focuser, while the flat-field design is enhanced by the same 0.1% anti-reflective coatings Lunt applies to its world-class solar etalons. This construction delivers maximum contrast for both detailed solar observation and faint deep-sky viewing.

    One Eyepiece, Multiple Magnifications: The 7.2-21.5mm Range

    A zoom eyepiece eliminates the need to swap between different eyepieces, saving critical time at the telescope. With a smooth twist, you can transition from a low-power 21.5mm for locating objects and enjoying wide-field context to a high-power 7.2mm for examining fine planetary detail, splitting close double stars, or resolving the texture in solar granulation. This seamless adjustment is ideal for finding the perfect magnification that atmospheric "seeing" conditions will support on any given night.

    Flat-Field Views with 0.1% Anti-Reflective Coatings

    Lunt engineers this eyepiece with a flat-field optical design, ensuring stars remain sharp points from the center of the view to the very edge, without the distortion or field curvature common in simpler designs. Critically, all air-to-glass surfaces feature advanced multi-layer coatings that reduce reflections to just 0.1%. These are the same coatings used on Lunt's professional solar filters, designed to maximize light throughput and suppress internal reflections for a dark background sky and brilliant, high-contrast solar details.

    Optimized for Both Solar and Night-Sky Observing

    While born from solar technology, this eyepiece is a true day-and-night instrument. For solar observers using a dedicated H-alpha or white-light telescope, the ultra-high-contrast coatings reveal subtle prominences and delicate surface details that are easily washed out by scattered light. After sunset, the same optical excellence translates to deep-sky and planetary viewing, delivering bright, clean images of everything from faint galaxies to the cloud bands of Jupiter.

    Lunt 7.2-21.5mm Zoom vs. A Set of Fixed Eyepieces

    The primary trade-off with any zoom eyepiece is convenience versus the potentially wider apparent fields of premium fixed focal length eyepieces. A set of three separate Plössl or wide-field eyepieces might offer a more immersive "spacewalk" feeling at each specific magnification.

    However, the Lunt Zoom offers compelling advantages. It replaces at least three separate eyepieces, reducing kit weight and cost while eliminating dust contamination from eyepiece changes. More importantly, it allows you to precisely dial in the ideal magnification, a capability that fixed eyepieces cannot match, making it an indispensable tool for planetary and solar imagers and visual observers alike.

  • How does the Lunt 7.2-21.5mm Zoom Eyepiece perform for solar viewing?

    The Lunt Zoom is specifically designed for solar work. It uses the same 0.1% anti-reflective coatings found in Lunt's high-end solar telescopes and etalons. This minimizes internal reflections and maximizes contrast, making it easier to see faint prominences, surface granulation, and filament details. The zoom function allows you to frame the full solar disk at 21.5mm and then magnify active regions at 7.2mm without changing eyepieces.

    Can I use the Lunt Zoom Eyepiece for deep-sky objects like the Orion Nebula (M42)?

    Yes, absolutely. The high-throughput coatings and flat-field design make it an excellent choice for deep-sky observing. At 21.5mm, you can frame large objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31). You can then zoom in to 7.2mm to resolve finer details, such as the individual stars of the Trapezium Cluster within M42.

    What is the benefit of the 0.1% anti-reflective coatings on the Lunt Zoom?

    These coatings are exceptionally efficient, allowing maximum light to pass through the glass to your eye while suppressing ghosting and flare. For astronomy, this results in:

    • Higher Contrast: A darker background sky, making faint objects stand out more clearly.
    • Brighter Images: More light from the object reaches your eye, which is critical for observing dim nebulae and galaxies.
    • Reduced Flare: When observing bright objects like the Moon or Jupiter, you'll see less distracting glare.

    Will the Lunt 7.2-21.5mm Zoom work with my 8" f/10 SCT?

    Yes, it's an excellent match. An 8" f/10 Schmidt-Cassegrain has a focal length of around 2000mm. The Lunt Zoom will provide a magnification range from approximately 93x (at 21.5mm) to 278x (at 7.2mm). This gives you a perfect low-power finding view and a powerful high-magnification option for planets and the Moon, all in one accessory.

    Does the view in the Lunt Zoom eyepiece stay in focus as I change magnification?

    High-quality zoom eyepieces like the Lunt are designed to be nearly parfocal, meaning the focus should remain very close as you zoom through the focal range. You may need to make a very slight adjustment to the focuser knob after a large change in magnification, but you will not have to completely refocus the telescope.

    How does the Lunt 7.2-21.5mm Zoom compare to carrying three separate eyepieces?

    The Lunt Zoom provides the convenience of an entire set of eyepieces in one unit. This means you spend less time fumbling in the dark and more time observing. It also prevents dust from entering your telescope tube during eyepiece swaps. While a set of premium fixed eyepieces might offer a wider apparent field of view, the Lunt Zoom's ability to fine-tune magnification is a unique advantage that a fixed set cannot offer.

  • Focal Length 7.2mm - 21.5mm Zoom
    Barrel Size 1.25"
    Optical Design Flat-Field
    Coatings 0.1% Anti-Reflective Multi-Coatings
    GTIN LS7-21ZE
  • Lunt Solar Systems 5-Year Warranty