Optec Inc. Optec-DSI 3.5x24tpi Extension Tube, 1/2” Length

Joint Development Effort: A collaborative creation by Deep Sky Instruments and Optec, specifically for enhancing large aperture telescopes.
Astro-Physics Compatibility: Complements the Astro-Physics 2.7-inch thread standard, expanding its application and use in astronomy.
Clear Aperture Optimization: Designed to allow more light passage, reducing edge ray clipping and enhancing overall telescope performance.
Robust Construction: Crafted from high-strength 6061 aluminum alloy, ensuring durability and reliability with a sleek black anodized finish.
Female and Male Thread Design: Features versatile female threads on one end and male threads on the other, with knurled bases for easy attachment and detachment.
Modular and Stackable Extensions: The 1/2” extension tube can be combined and stacked with others in the set, offering flexible extension solutions.
Precision Increments for Focal Lengths: Ideally suited for fixed focal length telescopes, providing necessary extensions in precise 1/4" (6.35mm) increments.
Minimized Internal Reflections: Equipped with anti-reflection threading and internal baffles to significantly reduce unwanted internal light reflections.
Non-Reflective Interior Coating: All internal surfaces are coated with an ultra-flat black paint, optimizing optical performance by minimizing internal reflections.
Enhanced Telescope Functionality: Suitable for astronomers and astrophotographers seeking to improve their telescope's capabilities with quality extension tubes.

Specifications

Overall Height: Varies
Clear Aperture: 3.25" (82.5mm)
Weight: 1.0 oz. (30 g)
Back-focus Usage: 0.50" (12.7mm)
Drawing
Table for spacer combinations.

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Optec Inc. Optec-DSI 3.5x24tpi Extension Tube, ½” length

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