Eyepiece cover Focus Optics dual 35.5 mm – protective cap for binoculars and telescopes

Focus Optics eyepiece cover dual 35.5 mm is a protective cap designed to fit eyepieces with a 35.5 mm diameter. The dual design covers both faces of an eyepiece or paired optics, providing protection during storage and transport. It prevents dust, moisture and minor scratches from reaching optical surfaces and is suitable for binoculars, spotting scopes and small telescopes used in field observation and basic astrophotography setups.

Advantages

The dual 35.5 mm eyepiece cover is made to fit snugly on standard 35.5 mm diameter eyepieces, ensuring a secure fit without adhesive or modification. Its durable material resists tearing and provides a soft barrier against abrasion while remaining lightweight. By covering both optical faces at once, it reduces the number of separate caps needed and speeds up packing and unpacking. The neutral design does not interfere with eyepiece housings or focuser movement when removed.

Suitable for

• Binocular eyepieces and objective pairs with 35.5 mm diameter
• Spotting scopes used for birdwatching and outdoor observation
• Small refractor or reflector telescope eyepieces for casual astrophotography
• Transport and storage of optics to prevent dust and moisture ingress

Key specifications

• Designed inner diameter: 35.5 mm (fits eyepieces with 35.5 mm outer diameter)
• Dual-sided design: covers both eyepiece faces or paired optics simultaneously
• Material: flexible, tear-resistant protective material (soft-contact surface)
• Weight: lightweight for minimal added bulk during transport
• Color: neutral finish compatible with most optical equipment

How to use

To use the Focus Optics dual 35.5 mm eyepiece cover, align the cap with the eyepiece barrel so that both faces are covered and press gently until the cover seats securely. Ensure the optical surfaces are clean and free of loose debris before fitting the cap to avoid trapping particles against the glass. Remove the cover by pulling evenly from the edges; avoid twisting motions that could catch on focuser components. Store the cap on the eyepiece during transport or place it inside a dedicated accessory pouch when not in use.

Usage recommendations

Regularly inspect and clean the inside of the cap with a soft cloth to remove accumulated dust. For long-term storage, combine the eyepiece cover with a dry, ventilated case and silica gel packets to reduce moisture exposure. Do not expose the cap to solvents or high heat; keep away from prolonged direct sunlight to preserve material flexibility.