Optec Inc. Optec-DSI 3.5x24tpi Knurled Female Threaded Retaining Ring

Innovative Joint Development: Created by Deep Sky Instruments and Optec, enhancing functionality for large aperture telescopes.
Astro-Physics Thread Standard: Adheres to the AP 2.7-inch thread, a benchmark in the astronomy industry established by Astro-Physics.
Optimal Light Transmission Design: Specifically designed to overcome the light clipping issues of the AP2.7 spacers, offering improved light passage.
High-Quality Material Construction: Crafted from 6061 aluminum alloy, known for its strength and durability, and finished with a black anodized coating for additional protection.
Versatile and Stackable Extensions: Features female threads and knurled bases, allowing for easy attachment, detachment, and stacking of extension tubes.
Precise Length Variations: Part of a versatile set offering critical extensions in 1/4" (6.35mm) increments, catering to fixed focal length telescope requirements.
Minimized Internal Reflections: Equipped with anti-reflective threading and internal baffles to significantly reduce internal light reflections, optimizing telescope performance.
Non-Reflective Internal Coating: All internal surfaces are coated with ultra-flat black paint, preventing any reflective disturbances and enhancing image quality.
Comprehensive Set Options: Available in multiple lengths (including ½”, ¾”, 1", 1-1/2", and 3") for a wide array of spacer combinations, ensuring broad compatibility with various telescope models.
Robust and Practical Design: The knurled feature on the female threaded retaining ring offers ease of use and secure fitting, making it ideal for astronomers and astrophotographers looking for reliable telescope extensions.

Specifications

Overall Height: 0.14" (3.5mm)
Clear Aperture: 3.45" (87mm)
Weight: 0.4 oz. (15 g)
Back-focus Usage: 0.10" (2.5mm)
Anodize: Gold
Drawing

Country

Country

Optec Inc. Optec-DSI 3.5x24tpi knurled female threaded retaining ring

Country

Country