Protective Dew Shield Celestron 6" Aluminum Washer with Lid 94020

The Celestron 6" Aluminum Washer with Lid is a protective dew shield designed specifically for 6-inch (approximately 150 mm) optical tubes. Constructed from lightweight aluminum, the washer fits over the telescope aperture to block dew, dust and incidental contact when the instrument is not in use or during transport. The included removable lid provides an additional barrier that can be taken on and off quickly for observing sessions or imaging setups.

Advantages

Made from corrosion-resistant aluminum, this washer offers a durable and lightweight solution for aperture protection without adding significant load to the optical tube. The precision fit reduces stray light and helps maintain a stable thermal environment at the aperture edge. The detachable lid simplifies protection during storage and transit and can be removed rapidly when the telescope is prepared for observation or photography.

Suitable for

• 6-inch (150 mm class) reflector and refractor telescope optical tubes
• Portable observing setups and field astronomy
• Imaging rigs where aperture protection is required between sessions
• Storage and transport to prevent dust, moisture and physical contact

Key specifications

• Material: Aluminum construction for durability and low weight
• Compatibility: Designed for optical tubes with a 6" (approx. 150 mm) front aperture
• Finish: Corrosion-resistant surface treatment suitable for outdoor use
• Design: Washer form factor with removable lid for quick access to the aperture
• Function: Protects against dew, dust and incidental physical contact

How to use

Place the washer over the telescope’s front aperture so that it seats evenly around the tube rim. Secure the washer according to the tube’s mounting or friction fit; the design permits a straightforward press-fit or light fastening depending on tube profile. To protect the aperture during storage or travel, attach the lid; remove the lid immediately before observing or imaging. Ensure the washer and lid are clean and dry before installation to avoid introducing debris to the optical system.

Usage recommendations

For best results, inspect the washer and lid periodically for dents or corrosion and clean them with a soft cloth. When using the telescope for extended imaging sessions, remove the lid only when necessary and allow the optical tube to thermally equilibrate after lid removal to reduce dew risk and image distortions.