Refractor telescope Skywatcher BK 1206 EQ3-2 120/600 — 120 mm aperture, 600 mm focal length, EQ3-2 mount

The Skywatcher BK 1206 EQ3-2 is a refractor telescope with a 120 mm aperture and 600 mm focal length, mounted on an EQ3-2 equatorial mount. Its fast f/5 focal ratio and relatively short focal length make it suitable for wide-field views of the Moon, planets and brighter deep-sky objects. The instrument is designed for field use and outreach: the optical tube is portable while the EQ3-2 mount provides a stable platform with manual slow-motion controls and polar alignment for tracking.

Advantages

This refractor offers a large 120 mm objective that gathers substantial light compared with small-aperture models, improving contrast and detail on lunar and planetary targets and increasing visibility of brighter nebulae and star clusters. The f/5 focal ratio delivers wide apparent fields on low- and medium-power eyepieces, making framing of extended objects easier. The included EQ3-2 equatorial mount enables sidereal tracking after polar alignment and provides manual slow-motion adjustments for accurate positioning. The overall combination balances aperture, portability and ease of setup for amateur observers.

Suitable for

• Planetary and lunar observation
• Wide-field deep-sky viewing of bright nebulae and open clusters
• Field astronomy and outreach events
• Beginners and intermediate hobby astronomers learning equatorial mounting and tracking

Key specifications

• Optical design: Achromatic refractor
• Aperture: 120 mm
• Focal length: 600 mm
• Focal ratio: f/5
• Mount type: EQ3-2 equatorial mount with manual slow-motion controls
• Portability: Compact optical tube suitable for transport to observing sites

How to use

Set the telescope on a stable tripod and mount the optical tube onto the EQ3-2. Perform polar alignment of the equatorial mount using the polar scope or drift/polar alignment routine relevant to your observing site. Start with a low-power eyepiece to locate targets and focus using the focuser. Use the mount’s slow-motion controls to center objects; once polar aligned, use sidereal tracking to follow celestial motion. For brighter deep-sky objects and lunar/planetary detail, increase magnification with higher-power eyepieces while checking focus and seeing conditions. Balance the optical tube on the mount before extended observing or astrophotography attempts.

Usage recommendations

Use low- to medium-power eyepieces for wide-field framing and quick target acquisition. Allow the telescope to thermally equilibrate outdoors for 20–30 minutes to improve image stability. For best results when observing planets, choose nights with steady atmospheric seeing and use shorter exposure astrophotography or visual eyepiece observation rather than long-exposure deep-sky imaging.