Orion 2" Twist-Tight Dielectric Mirror Star Diagonal - 40902

The Orion 2" Twist-Tight Dielectric Mirror Star Diagonal delivers bright, high-contrast views and a comfortable 90° viewing angle for astronomical observing. Featuring a premium dielectric-coated mirror with 99% reflectivity, this diagonal minimizes light loss while providing excellent image brightness and clarity.

Its innovative Twist-Tight locking mechanism securely holds eyepieces and accessories in place without traditional thumbscrews. The self-centering design applies even pressure around the eyepiece barrel, helping maintain proper optical alignment while preventing scratches and marks. Ideal for refractor and compatible Cassegrain-style telescopes equipped with a 2" focuser or visual back, this diagonal combines high-quality optics with durable construction.

Key Features

• 99% Reflective Dielectric Mirror: High-efficiency dielectric coatings maximize light transmission to the eyepiece, delivering bright, detailed, and high-contrast views.

• Twist-Tight Locking Mechanism: Securely grips eyepieces using a convenient rotating collar, eliminating traditional thumbscrews and helping prevent scratches.

• Self-Centering Eyepiece Holder: Applies even pressure around the eyepiece barrel to maintain consistent optical alignment and a secure fit.

• 90° Viewing Angle: Provides a more comfortable observing position, especially when viewing objects high in the night sky.

• Compatible with 2" and 1.25" Eyepieces: Includes a 2"-to-1.25" step-down adapter with its own Twist-Tight locking mechanism for convenient use with both eyepiece sizes.

• Durable Aluminum Construction: Features a precision-machined, anodized aluminum housing for strength, stability, and long-lasting performance.

• Internal Glare Reduction: Machine-threaded internal baffles help suppress stray light and unwanted reflections for improved image contrast.

• 2" Filter Compatibility: The threaded 2" nosepiece accepts standard 2" astronomy filters, allowing filters to remain installed when switching eyepieces.

• Easy Operation: The large, knurled Twist-Tight collars provide a comfortable grip, even when wearing gloves during cold-weather observing.

Specifications

• Brand: Orion Telescopes & Binoculars

• Model Number: 40902

• Product Type: Mirror Star Diagonal

• Diagonal Size: 2" (50.8 mm)

• Viewing Angle: 90°

• Mirror Coating: Dielectric

• Reflectivity: 99%

• Eyepiece Connection: 2" Twist-Tight

• Telescope Connection: 2" Slip-Fit Barrel

• Eyepiece Adapter: 2"-to-1.25" Twist-Tight Adapter

• Housing Material: Machined and Anodized Aluminum

• Filter Threads: 2" Nosepiece

• Recommended Telescopes: Refractors and compatible Cassegrain-style telescopes with 2" connections

What's Included

• Orion 2" Twist-Tight Dielectric Mirror Star Diagonal

• 2"-to-1.25" Twist-Tight Eyepiece Adapter

• Protective Dust Caps

Compatibility Note: Requires a compatible 2" focuser or visual back. This diagonal is not recommended for Newtonian reflector telescopes.