Optec Inc. AP2.7 x 24tpi Extension Tube Set: Versatile and Durable for Telescope Customization

• Standardized AP2.7 Inch Threads: Adheres to the astronomy industry standard set by Astro-Physics, ensuring compatibility with a wide range of equipment.
• Flexible Extension Options: Features female threads on one end and male threads on the other, with knurled bases for easy attachment and detachment.
• Stackable Design: Extensions can be combined and stacked, providing versatile length adjustments for fixed focal length telescopes.
• Optimized Spacer Combinations: The four and five-piece sets offer various spacer combinations in 1/4" (6.35mm) increments, allowing for precise focal adjustments.
• Durable Material Construction: Made from high-strength 6061 aluminum alloy and finished with black anodizing for durability and a sleek appearance.
• Anti-Reflection Features: Includes internal baffles and anti-reflection threading, especially in the largest extension tube, to minimize internal reflections.
• Ultra-Flat Black Paint: All internal surfaces are coated with a non-reflecting, ultra-flat black paint, enhancing image quality by reducing internal light scattering.
• Versatile Telescope Compatibility: Ideal for astronomers and astrophotographers looking to customize their telescopes for specific observational needs.
• Professional Quality Accessory: A must-have for serious telescope users seeking professional-grade extension tubes for their equipment.
• Easy Integration: Designed for straightforward integration with existing telescope setups, enhancing the overall functionality and user experience.

Specifications

AP2.7 Extension Tube Set, 5-piece set

• Includes: 1/2", 3/4", 1", 1-1/2", and 3"
• Possible spacer combinations:
• 0.5" through 6.25" with 1/4-inch increments plus 6.75" with all spacers combined. (See Table for combinations.)
• Thread Specification