Helios Glass Binocular Solar Filter Kit – Slip-On Front-Mounted Solar Imaging Accessory (Pair)

• ND5 white-light attenuation for solar observation
• Optical-grade glass construction
• Matched slip-on pair for binocular use
• Designed for secure front-mounted installation

When used correctly, binocular solar filters allow you to observe the Sun’s photosphere, including visible sunspots and surface detail. Binocular viewing can provide a more comfortable and immersive observing experience for some users.

For imaging and technique expectations, see Getting Started with Solar Photography →

This filter uses high-quality optical materials selected for solar observation, balancing clarity, durability, and safe light reduction. The filter is designed for repeated handling and secure mounting when properly sized.

To compare materials and understand which option is best for your needs, see Materials & Optics Explained →

This filter set is intended for front-mounted use only on compatible binoculars. Always ensure that both barrels are fitted with filters before aiming the binoculars at the Sun.

Inspect both filters before each use and discontinue use if either filter is damaged or compromised. Ensure each filter is securely installed and cannot be dislodged during use.

Never look at the Sun through binoculars or any optical instrument without properly installed solar filters on both sides. This product is intended for solar viewing only when used correctly.

For detailed safety guidance, see Solar Filter Safety & Proper Use →

Measure the outside diameter of the tube or barrel where the filter will slip on, using a ruler or calipers. Measure across the widest point for accuracy.

See the Sizing & Fit Guide →

Measure the outside diameter (OD) of one barrel and select the size that matches that measurement.

If your measurement falls between sizes, choose the next size up. This ensures proper clearance and avoids forcing the filter onto the tube.

This filter fits instruments where the measured outer diameter (OD) matches the selected size range. If you’re unsure about compatibility, review the sizing guide or contact us before ordering.

You’ll be able to safely observe the Sun’s surface, including sunspots and other visible features, depending on conditions and optics.

Eligible unused filters may be returned or exchanged within 30 days of delivery. A 10% restocking fee applies to non-defective returns and exchanges. Original shipping is nonrefundable; orders that received free or discounted shipping have Seymour Solar’s actual outbound shipping cost deducted. Customers are responsible for return shipping.

Because correct sizing is important for safe use, measure carefully before ordering and review our sizing guidance if you’re unsure. View the complete return policy.