Barlow lens Tele Vue Big Barlow Lens 2x 2-inch — 2× magnification, 2" barrel

The Tele Vue Big Barlow Lens 2x with a 2" barrel increases the effective focal length of compatible eyepieces by a fixed factor of two. It is designed for telescopes that accept 2" accessories and provides a straightforward way to double magnification without changing eyepieces. The optical design maintains image quality across the field, making it suitable for higher-power views where detail is important.

Advantages

This 2× Barlow lens delivers a stable, predictable increase in magnification while preserving contrast and sharpness. The 2" barrel format provides secure mechanical fit and compatibility with common 2" focuser systems and accessories. Its fixed magnification factor simplifies imaging and visual observing workflows, and it avoids the need to purchase additional high-power eyepieces to achieve greater magnification.

Suitable for

• Planetary and lunar observation requiring increased magnification
• High-magnification visual viewing of double stars and planetary detail
• Extending the usable range of existing eyepieces without changing oculars
• Astrophotography where a simple, fixed focal length multiplier is needed

Key specifications

• Magnification factor: 2× fixed
• Barrel diameter: 2 inches (standard 2" accessory size)
• Optical purpose: increases telescope effective focal length for eyepieces
• Compatibility: designed for telescopes and focusers that accept 2" accessories
• Application: visual observing and compatible imaging uses

How to use

Insert the Tele Vue Big Barlow Lens into the telescope focuser and secure it as you would any 2" accessory, then insert the eyepiece into the Barlow's eyepiece socket. Focus the telescope normally; the Barlow effectively doubles the focal length seen by the eyepiece, so fine focus adjustments may be required. For imaging, mount the camera or adapter in place of a visual eyepiece following the same procedure. Ensure all connections are tightened to avoid image shift during focusing.

Usage recommendations

Use the Barlow with eyepieces that perform well at higher focal ratios to maintain image sharpness. For the best results on planets and the Moon, pair with high-quality, medium- to high-power eyepieces and allow the telescope to reach thermal equilibrium before attempting detailed observations.