Zonfilter ClearWhite Baader ASTF 200 AstroSolar OD 5.1 200 mm

With an optical density of 5.1, this Baader filter blocks 99.999% of harmful solar radiation, allowing safe, high-resolution white light observation of the Sun's photosphere. The 200 mm clear aperture fits telescopes with a matching objective diameter, delivering a natural white solar image with diffraction-limited performance.

Overview

The Baader ASTF 200 AstroSolar Safety Filter is a front-end objective filter designed for visual solar observation. It uses Baader's AstroSolar Safety Film, a 0.012 mm thick polymer film with a light transmission of just 0.000008%, ensuring complete protection against UV, IR, and visible light. The filter cell is machined from anodized aluminum and attaches securely to the telescope tube via three adjustable screws with plastic tips, preventing damage to the optical tube assembly.

What stands out

• Certified to EN ISO 12312-2:2015 for direct solar viewing
• Natural white solar image with no colour cast
• Diffraction-limited optical quality preserves fine detail
• Includes protective storage box for safe transport
• Easy installation without tools

Technical details

• Filter type: AstroSolar Safety Filter
• Optical density: 5.1
• Clear aperture: 200 mm
• Film technology: Baader AstroSolar Safety Film
• Observation mode: Visual solar observation
• Mounting: Front-end telescope objective filter
• Compatible telescope aperture: 200 mm
• Solar image colour: Natural white
• Safety certification: CE certified (EN ISO 12312-2:2015)
• Filter cell material: Anodized aluminum
• Mounting mechanism: Three adjustable screws with plastic tips
• Protection: Blocks 99.999% of harmful UV, IR, and visible light
• Resolution: Diffraction-limited
• Storage: Includes protective storage box
• Film thickness: 0.012 mm
• Light transmission: 0.000008%
• Series: ASTF (AstroSolar Telescope Filter)

Our verdict

A premium solar filter that combines certified safety with exceptional optical performance. The 200 mm aperture is ideal for detailed sunspot and granulation observation, and the natural white image is a joy to view. The robust aluminum cell and included storage box make it a reliable companion for any solar observer.