Refractor telescope Skywatcher BK 705 AZ2 70mm aperture 500mm focal length

Skywatcher BK 705 AZ2 is a 70 mm aperture refractor telescope with a 500 mm focal length on an AZ2 alt‑azimuth mount. The optical tube delivers a wide, low‑magnification view suitable for daylight terrestrial observation and basic astronomical targets. The package emphasizes a compact footprint and manual alt‑azimuth operation that makes setup and pointing straightforward for casual users and beginners.

Advantages

The BK 705 AZ2 combines a 70 mm objective lens with a 500 mm focal length to provide a balance between light gathering and portability. The refractor design requires minimal collimation and maintenance compared with reflectors. The AZ2 mount enables intuitive up/down and left/right motion for simple tracking of moving subjects and quick target acquisition. Optical characteristics and mechanical simplicity make it well suited for lunar and planetary viewing, as well as daytime landscape observations.

Suitable for

• Beginner astronomical observing: Moon and bright planets
• Terrestrial viewing: landscapes, wildlife at moderate distances
• Portable field use and casual backyard observing
• Educational and introductory astronomy demonstrations

Key specifications

• Optical design: Refractor (achromatic objective)
• Aperture: 70 mm
• Focal length: 500 mm
• Mount type: Alt‑azimuth (AZ2) with manual controls
• Recommended use: Terrestrial and basic astronomical observation
• Portability: Compact optical tube suitable for easy transport

How to use

Assemble the optical tube onto the AZ2 mount and secure the tube within the mounting cradle, then balance and tighten the mounting screws. Insert an appropriate eyepiece into the 1.25" focuser and begin with a low‑power eyepiece to locate targets. Use the alt‑azimuth controls to point the telescope and make fine adjustments to center objects. For night observing, allow the telescope to cool to ambient temperature for improved image stability. Change to higher magnification eyepieces as needed for lunar and planetary detail, and refocus after each eyepiece change.

Usage recommendations

Use a sturdy tripod and start with low magnification to simplify target acquisition. For best results when observing celestial objects, choose nights with steady atmospheric seeing and avoid viewing through heat sources or turbulent air over roofs and paved surfaces. Store the telescope in a dry place and protect the objective lens with a cap when not in use to maintain optical performance.