SVBONY Variable Polarizing Moon Filter for 1.25" & 2" Eyepieces

The SVBONY Variable Polarizing Filter is an essential telescope accessory for comfortable lunar, planetary, and terrestrial observation. Acting like a precision dimmer switch for your eyepiece, it allows you to progressively reduce brightness and glare, making bright targets such as the Moon far easier to observe in sharp detail.

Available in both 1.25" and 2" formats, this premium filter uses high-definition optical glass with a durable metal housing for smooth, repeatable light control.

Perfect for Lunar Viewing

When observing the Moon through larger telescopes, brightness can become overwhelming and reduce visible surface detail. This filter reduces incoming light and improves contrast, allowing lunar craters, maria, and fine terminator detail to stand out with greater comfort.

Fully Adjustable Light Transmission

Unlike fixed moon filters, the variable design lets you rotate the housing to fine-tune brightness for the exact observing conditions.

• 1.25" version: adjustable from approximately 1% to 80%
• 2" version: adjustable from approximately 1% to 40%

This makes it ideal for different lunar phases, bright planets, and varying telescope apertures.

Improves Planetary & Terrestrial Contrast

The filter is also highly effective for reducing glare from Venus, Jupiter, bright planetary targets, snow, sand, and daytime terrestrial viewing. It helps preserve fine detail while preventing eye strain.

Premium Optical Construction

Manufactured from HD optical glass with excellent light transmission and housed in a precision-machined metal cell, the filter offers durability and consistent performance. A protective storage case is included.

Compatibility

The 1.25" version uses a standard M28.5 x 0.6 filter thread, ensuring compatibility with most 1.25" eyepieces, diagonals, and accessories. The 2" version fits standard 2" accessories.

Best Uses

• Lunar observation
• Bright planetary viewing
• Large aperture Dobsonian telescopes
• Terrestrial snow and sand glare reduction
• Comfortable public outreach viewing