Optec Inc. AP2.7 x 24tpi Extension Tube, 1-½” Length: Precision Extension for Telescopes

• Standard AP2.7 Inch Threads: Adopts the industry standard AP2.7 inch thread, ensuring wide compatibility with various astronomy equipment.
• Dual Thread Design: Features female threads on one end and male threads on the opposite, facilitating easy attachment and removal.
• Knurled Bases for Ease of Use: The knurled base design enhances grip, making the tube easy to attach and detach from other equipment.
• Stackable and Versatile: Designed to be combined and stacked with other extensions, providing flexibility in achieving the desired length.
• Ideal for Fixed Focal Length Telescopes: Suitable for fixed focal length telescopes, offering 1/4" (6.35mm) increments for precise focal adjustments.
• Durable Material: Constructed from high-strength 6061 aluminum alloy, ensuring durability and longevity, and finished with a black anodized coating.
• Minimized Internal Reflections: Equipped with anti-reflection threading and internal baffles to reduce internal light reflections.
• Non-Reflecting Internal Paint: All internal surfaces are coated with ultra-flat, non-reflecting black paint, further reducing unwanted light scatter.
• Professional Grade Telescope Accessory: A high-quality, professional-grade extension tube, essential for serious astronomers and astrophotographers.
• Optimized for Telescope Customization: Designed to seamlessly integrate with existing telescope setups, enhancing overall functionality and user experience.

Specifications

• Overall Height: 1.87 (47.5mm)
• Clear Aperture: 2.52" (64mm)
• Weight: 2.4 oz (70 g)
• Back-focus Usage: 1.50" (38.1mm)
• Drawing
• Thread Specification