William Optics 90° 2″ Diagonaal Spiegel Dura Bright: de topdiagonaal voor je 2 inch park
The William Optics Dura Bright 2-inch diagonal is the accessory that will improve the performance of your entire eyepiece set. The dielectric coating reflects 99.1% of the light, and the mirror is polished to 1/12 lambda: maximum brightness and a sharp, clear image even at high magnification.
The 12 mm thick mirror remains dimensionally stable during temperature changes. The housing combines aluminum with carbon: rigid, lightweight, and beautifully finished.





For your entire accessory fleet
The 2-inch compression ring clamps large eyepieces scratch-free and evenly all around; the included 1.25-inch adapter accommodates your smaller eyepieces. A filter thread places 2-inch filters directly in the light path.

Also on SC telescopes
With the separately available William Optics SC adapter, this diagonal screws directly onto the rear thread of a Schmidt-Cassegrain: more rigid than any clamp connection.
Included
- Dura Bright 2-inch diagonal mirror
- 1.25 inch eyepiece adapter
- Dust caps
Featured accessories
Combine the diagonal with the SWAN 40 mm 2-inch eyepiece for maximum field of view, or with the SC adapter for mounting on a Schmidt-Cassegrain.
For whom yes and for whom no
- ✓ Observers with 2-inch eyepieces on a refractor or catadioptric
- ✓ For anyone looking for a diagonal that will last a lifetime
- ✗ Newton owners: a diagonal has no function there
Specifications
| Type | 90-Degree Diagonal Mirror |
| Reflection | 99%, dielectric coating |
| Mirror | 12 mm thick, 1/12 lambda |
| Housing | Aluminum with carbon |
| Ocular clamp | Compression ring 2 inch, 1.25 inch adapter included |
| Filter thread | Yes, 2 inches |
You can find more accessories for this merk at the William Optics merk Page.





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