Eyepiece SW Sky Panorama 23mm SW-5340 82° apparent field

The Sky-Watcher Sky Panorama 23mm eyepiece (82° apparent field) is a wide-angle ocular designed for general astronomical observation. With a 23 mm focal length and a broad apparent field of view, this eyepiece produces immersive star fields and expanded views of extended deep-sky objects while retaining useful magnification for lunar and planetary observing depending on the telescope focal length. The optical design emphasises a large usable field and comfortable eye relief to support longer observing sessions.

Advantages

The 82° apparent field reduces the sense of tunnel vision and allows more of the sky to be seen at once, improving star-hopping and framing of nebulae and star clusters. Its 23 mm focal length offers a balance between wide-field context and sufficient exit pupil for dim-object viewing. The eyepiece is built for compatibility with standard telescope focusers; adapters may be required separately for non-standard barrel sizes. Eye relief and field flatness are engineered to provide comfortable viewing for eyeglass wearers and extended sessions.

Suitable for

• Wide-field observations of open clusters, large nebulae and the Milky Way
• General-purpose planetary and lunar viewing at moderate magnification
• Star-hopping and visual search of faint deep-sky objects
• Public outreach and observing sessions where a comfortable, immersive view is beneficial

Key specifications

• Focal length: 23 mm
• Apparent field of view: 82°
• Optical type: wide-angle eyepiece (multi-element design)
• Designed for standard telescope focusers (confirm adapter separately for other barrel sizes)
• Comfortable eye relief suitable for extended observing and eyeglass wearers

How to use

Insert the eyepiece into the telescope focuser or diagonal and secure it with the focuser thumbscrew. Allow the telescope to reach thermal equilibrium for best image stability, then use the focuser to achieve sharp focus on the target. For best wide-field performance, place the eyepiece in the appropriate position within the focuser (fully inserted unless an adapter or extension is required). When sharing the eyepiece with observers who wear glasses, adjust your eye position to the point where the full field becomes visible.

Usage recommendations

Use this eyepiece on telescopes with moderate to long focal lengths for comfortable planetary views and on short- to medium-focal-length telescopes for expansive deep-sky fields. Verify focuser barrel size and obtain any needed adapter before use. For dim deep-sky objects, observe from dark sites and allow eyes to adapt to darkness to fully benefit from the wide 82° field.