Sky-Watcher 9mm Ultra-Wide Angle 66° 1.25" Eyepiece

Description

Sky-Watcher 9mm Ultra-Wide Angle 66° 1.25" Eyepiece

The Sky-Watcher 9mm Ultra-Wide Angle 66° 1.25" Eyepiece is designed for amateur astronomers who want a combination of useful magnification, a wide apparent field of view, and comfortable viewing. With a 9mm focal length and a 66° apparent field of view, it is a versatile choice for observing the Moon, planets, double stars, and many compact deep-sky objects.

Versatile 9mm Focal Length

The 9mm focal length provides medium-to-high magnification, depending on the telescope used. It can be particularly useful when more detail is required than a longer-focal-length eyepiece can provide, while still offering a somewhat wider and more manageable field of view than very short focal-length eyepieces.

The actual magnification depends on the focal length of your telescope. For example:

• A 600mm focal-length telescope provides approximately 67× magnification.
• A 750mm telescope provides approximately 83× magnification.
• A 1000mm telescope provides approximately 111× magnification.
• A 1200mm telescope provides approximately 133× magnification.

This makes the 9mm eyepiece a useful focal length for a wide range of telescopes.

Wide 66° Apparent Field of View

The eyepiece provides a 66° apparent field of view, giving a wider viewing experience than traditional narrow-field eyepieces. The wider apparent field allows you to see more of the surrounding sky and can make observing more immersive.

A wide field of view is also useful with manually operated telescopes. Because celestial objects appear to drift across the eyepiece as Earth rotates, a wider field gives the observer more time before the object moves toward the edge of the field.

The actual true field of view depends on the telescope and its focal length.

Multi-Coated Optics

The Sky-Watcher 9mm Ultra-Wide Angle Eyepiece features multi-coated optics designed to improve light transmission and reduce unwanted reflections. These optical coatings help provide bright and clear views while maintaining good contrast.

As with any eyepiece, the final image quality also depends on the telescope's optical quality, atmospheric conditions, collimation, and observing environment.

Comfortable 15mm Eye Relief

With approximately 15mm of eye relief, the 9mm eyepiece provides a comfortable viewing experience for many observers. The eye relief allows the observer to position their eye at a practical distance from the eyepiece while maintaining the full field of view.

The eyepiece also features a rubber eyecup, which helps provide a comfortable and consistent viewing position.

Excellent for Lunar and Planetary Observation

The 9mm focal length is well suited to lunar and planetary observation when atmospheric conditions allow higher magnification. The Moon can show a wealth of surface detail, including craters, mountains, valleys, and the shadows cast by crater walls.

When observing planets, the eyepiece can be used to examine features such as Jupiter's cloud bands and its bright moons, Saturn's rings, and other planetary details that become more visible at higher magnification.

High magnification also magnifies atmospheric turbulence, so the clearest planetary views are generally obtained during periods of steady atmospheric conditions.

Useful for Deep-Sky Observation

Although the 9mm Ultra-Wide Angle Eyepiece is well suited to lunar and planetary observation, it can also be useful for selected deep-sky targets. Globular clusters, planetary nebulae, compact star clusters, and double stars can benefit from the additional magnification provided by a 9mm eyepiece.

For larger deep-sky objects, a longer focal-length eyepiece may be more appropriate because it provides a wider true field of view.

Standard 1.25" Barrel

The eyepiece uses a standard 1.25-inch barrel, making it compatible with telescopes and accessories equipped with a 1.25" focuser, star diagonal, or other suitable eyepiece holder.

Its compact format also makes it easy to carry as part of a general-purpose eyepiece collection.

A Versatile Addition to Your Eyepiece Collection

The Sky-Watcher 9mm Ultra-Wide Angle 66° 1.25" Eyepiece offers a useful combination of magnification, wide apparent field of view, and comfortable eye relief. Its 9mm focal length fills the gap between longer low-power eyepieces and very short high-power eyepieces, making it a practical choice for many observing situations.

Whether you are exploring lunar craters, observing planetary details, splitting double stars, or examining compact deep-sky objects, the 9mm Ultra-Wide Angle provides a useful high-magnification option for a wide range of amateur telescopes.

Specifications

Please note:  The actual product may differ slightly from the images in terms of color, finish, or other minor details.