William Optics Dura Bright 1.25″ 90° Mirror Star Diagonal
Original price was: $179.00.$98.99Current price is: $98.99.
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Product description
A dramatic step forward in the evolution of mirror diagonals!
This mirror-type star diagonal has a dielectric mirror coatings for 99% reflectivity which provides higher contrast and resolution during critical planetary, lunar and binary star observations.
Top-Notch Performance and brightness:
- High precision 12mm thick mirror substrate flat for optimal image stability
- Polished to 1/10th wave accuracy
- Accurate design guarantees constant alignment. No further alignment needed
Meticulous Craftsmanship:
- Lock screw for eyepiece or adapter
- Big, knurled thumbscrews are easy to turn even with gloves on
- High-quality machining out of aluminum
- Internal antireflection baffling for highest contrast
- Real Carbon Fiber side plates
Superbly Constructed:
- Compression rings (both on diagonal and adapter) to prevent barrels from marring
- Internal safety stop prevents 1.25″ barrels from hitting the mirror
- Designed for high-end scope
| Coating of optical system | dielectric |
|---|---|
| Connection (to the telescope) | 1,25"1.25" A standard measurement for accessories, expressed as 1.25 inches. 1.25" is equal to 31.8 millimetres.Click to read more… |
| Connection ( to eyepiece) | 1,25" |
| Surface accuracy | 1/10 |
| Surface reflection | 99 |
| Viewing posture | 90° |
| Filter thread | yes |
| Ring clamp | yes |
| Weight(g) | 210 |
| Type | Deviating optics Erecting lenses Telescopes with a focuser at the rear end require an erecting lens to ensure a comfortable viewing position.Click to read more… |
| Type of build | Diagonal mirror Zenith mirror Provides a comfortable telescope viewing position.Click to read more… |
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