TMB 58-Degree Wide-Angle Planetary HD Eyepiece for Astronomical Telescopes

This TMB eyepiece is a practical accessory for astronomy enthusiasts who want to observe the moon, Jupiter, Saturn, and other planets with greater detail. Its wide 58-degree apparent field of view helps frame planetary targets comfortably, while the multi-coated lenses improve light transmission for brighter images. The eyepiece is constructed with a 4-group 6-element optical design to reduce aberrations and deliver sharp views. With multiple focal length options from 2.5mm to 9mm, you can choose the magnification that best suits your telescope and target.

Features and Construction

Built for reliable planetary observation, this eyepiece combines optical precision with practical design details. The black finish reduces stray light, and the compact barrel fits standard telescope focusers.

Optical Design

The 4-group 6-element structure uses multi-coated lenses to enhance image contrast and colour fidelity. This design helps minimise chromatic aberration when viewing bright planets like Jupiter and Saturn.

Apparent Field of View

A 58-degree apparent field of view provides a wider window to the night sky, making it easier to track planets across the field without constantly repositioning the telescope.

Focal Length Options

Available in 2.5mm, 3.2mm, 4.5mm, 4mm, 5mm, 6mm, 7.5mm, 7mm, 8mm, and 9mm versions, this eyepiece allows you to match magnification to your telescope's focal length and the observing conditions.

Uses and Placement

This eyepiece is designed for visual astronomy, particularly for high-magnification observation of solar system objects. Its wide field and multi-coating make it suitable for both beginners and experienced stargazers.

Planetary Observation

Use this eyepiece to observe the moon's craters, Jupiter's cloud bands, and Saturn's rings. The 58-degree field helps keep the planet centred at higher magnifications.

Lunar Viewing

The bright multi-coated views are particularly effective for studying lunar terrain, from large maria to small craterlets near the terminator.

General Deep-Sky Use

While optimised for planets, the wide field can also be used on brighter deep-sky objects such as star clusters and nebulae, providing a versatile addition to your eyepiece set.

Benefits and Buying Value

This eyepiece offers a practical way to upgrade your telescope's planetary viewing performance without a large investment. Its optical design and focal length range give you flexibility for different observing sessions.

Multi-Coated Lenses

The multi-coating reduces light scatter and improves image brightness, helping you see finer details on planetary surfaces and lunar features.

Wide Range of Focal Lengths

With ten focal lengths available, you can select the right magnification for each target. Shorter focal lengths (2.5mm-4mm) provide high power for bright planets; longer ones (7mm-9mm) offer wider, steadier views.

Simple Maintenance

The eyepiece body is straightforward to clean with a soft brush or lens cloth, and the metal barrel resists wear from regular use. Store it in a dry case to keep optics dust-free.