Refractor telescope Skywatcher BK 609 EQ1 60mm aperture 900mm focal length

The Skywatcher BK 609 EQ1 is a 60 mm aperture refractor telescope with a 900 mm focal length mounted on an EQ1 equatorial-style mount. It is designed for terrestrial viewing and basic astronomical observation, offering clear, high-contrast images of the Moon, bright planets and distant landscapes. The optical tube and mount are compact and lightweight for easy transport and quick setup, making this model suitable for beginners and casual observers who need a straightforward, entry-level instrument.

Advantages

The 60 mm objective lens and 900 mm focal length yield a balanced combination of light gathering and image scale, delivering crisp views of lunar features and bright planetary disks. The refractor design requires minimal maintenance and generally stays in collimation, while the EQ1 equatorial-style mount simplifies tracking of celestial objects when aligned. The telescope is portable and quick to assemble, allowing users to move between observing sites with little effort.

Suitable for

• Beginner astronomical observation of the Moon and bright planets
• Terrestrial viewing: birdwatching, coastal and landscape observation
• Learning basic equatorial mount alignment and manual tracking
• Casual observing sessions and quick setup in different locations

When it may not be suitable

This instrument has a small 60 mm aperture, so it is not intended for deep-sky observation of faint nebulae, galaxies or star clusters. High-magnification planetary imaging or advanced astrophotography is limited by the simple mount and modest aperture; long-exposure tracking and heavy camera setups are not supported. Users seeking large-aperture light-gathering power or precision computerized tracking should consider more advanced models.

Key specifications

• Optical design: Achromatic refractor
• Aperture: 60 mm
• Focal length: 900 mm
• Focal ratio: f/15
• Mount type: EQ1 equatorial-style mount (manual)
• Suitable for eyepieces with 1.25" barrel
• Portable, lightweight optical tube and mount

How to use

Assemble the optical tube onto the EQ1 mount using the dovetail and secure the finder scope if included. Balance the tube on the mount and set the latitude adjustment approximately to your observing location. Insert a low-power 1.25" eyepiece to begin locating targets and use the slow-motion controls to perform manual tracking. For terrestrial use, set the mount near polar alignment for smoother motion, or use alt-azimuth handling for quick framing. Collimate and clean lenses only as needed following manufacturer guidelines.

What to consider before purchase

• Intended use: terrestrial viewing and basic planetary or lunar observation
• Limitations: small aperture for deep-sky objects and limited astrophotography capability
• Accessories: check included eyepieces, finder, diagonal and tripod specifications
• Portability needs: compact size suitable for easy transport

Usage recommendations

Use low- to medium-power eyepieces to start (e.g., 25–10 mm) for wide-field locating and switch to higher power for lunar and planetary details when atmospheric seeing allows. Allow the telescope to reach thermal equilibrium with the outside air for sharper views, and perform basic polar alignment on the EQ1 mount to reduce manual tracking corrections during observation.