Collection: ND5 White Light Telescope Filters

Observe the Sun safely and in detail with Seymour Solar’s ND5 White Light telescope filters. Each filter blocks 99.999% of sunlight, revealing the Sun’s surface with crisp, natural contrast — perfect for viewing sunspots, granulation, eclipses, and planetary transits.

Filter Types

• Helios Glass® – Titanium-coated optical glass for ultra-sharp, high-contrast views.
• Hyperion Film – Lightweight ND5 polymer film for portable, everyday solar observation.
• Off-Axis Helios Glass® – For telescopes with central obstructions or large apertures.

What You’ll See

• Sunspots — including umbra and penumbra structure
• Solar granulation — surface texture in true white light
• The Moon’s silhouette during solar eclipses
• Transits of Mercury or Venus (when visible)

Product Highlights

• ND5 Optical Density: Blocks 99.999% of visible, UV, and IR light for safe front-mounted solar viewing.
• Made in the USA: Precision-assembled aluminum cells with secure nylon thumb screws.
• Fits: 50mm – 100mm telescope objective diameters.

Not sure what size you need? Click here to measure your telescope for the perfect filter fit.

Safety Note

Seymour Solar ND5 White Light filters are designed for front-mounted use on telescopes only. They achieve transmittance levels appropriate for safe solar observation in white light. These are not eclipse glasses and are not certified under ISO 12312-2, which applies only to eyewear.

Frequently Asked Questions

• Can I use these to view an eclipse?
  Yes, when front-mounted on your telescope. Always mount before aiming at the Sun.
• What’s the difference between Helios Glass® and Hyperion Film?
  Helios Glass offers higher optical precision; Hyperion Film is lighter and ideal for travel or quick setups.
• When should I use an Off-Axis Filter?
  For reflectors or SCTs with central obstructions — it prevents vignetting and improves contrast.

Always mount filters securely on the sun-facing end of your telescope before pointing at the Sun.