William Optics Dura Bright 1.25" 90° mirror star diagonal

This mirror-type star diagonal features dielectric mirror coatings for 99% reflectivity, ensuring heightened contrast and resolution, particularly for critical planetary, lunar, and binary star observations.

• Outstanding Performance and Brightness:
• High-precision 12mm thick mirror substrate flat for optimal image stability
• Polished to 1/10th wave accuracy
• Accurate design ensures constant alignment, eliminating the need for further adjustments
• Meticulous Craftsmanship:
• Lock screw for eyepiece or adapter
• Large, knurled thumbscrews for easy handling, even with gloves
• Precision machining from aluminum
• Internal antireflection baffling for maximum contrast
• Real Carbon Fiber side plates
• Superior Construction:
• Compression rings (both on diagonal and adapter) prevent barrels from marring
• Internal safety stop prevents 1.25" barrels from impacting the mirror
• Designed for high-end scopes

SPECIFICATIONS

Capacity

Coating of optical system: Dielectric

Connection (to the telescope): 1.25"

Connection (to eyepiece): 1.25"

Surface accuracy: 1/10

Surface reflection: 99%

Viewing posture: 90°

Special features

Filter thread: Yes

Ring clamp: Yes

General

Weight (g): 210

Type: Deviating optics

Type of build: Diagonal mirror