{"id":34219,"date":"2025-11-17T15:31:20","date_gmt":"2025-11-17T14:31:20","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34219"},"modified":"2026-08-25T15:11:44","modified_gmt":"2026-08-25T13:11:44","slug":"william-optics-90-125-dura-bright-zenith-mirror","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-90-125-dura-bright-zenitspiegel\/","title":{"rendered":"William Optics 90\u00b0, 1.25\u2033 Dura Bright zenith mirror"},"content":{"rendered":"

William Optics 90\u00b0, 1.25\u2033 Dura Bright Zenith Mirror: 99%\u2014your light, delivered in perfect condition<\/strong><\/h2>\n\n\n\n

The William Optics Dura Bright is a top-of-the-line 1.25-inch zenith mirror. The dielectric coating reflects 99.1% of the light: virtually all the light your telescope captures reaches your eye. This is reflected in brightness and contrast, especially when observing planets, close binary stars, and at high magnifications.<\/p>\n\n\n\n

The mirror itself is 12 mm thick and polished to 1\/10 wave accuracy: rigid and pure, without distortion during temperature changes. The housing with carbon fiber side plates is light and stiff, and the compression ring clamps your eyepiece all around and scratch-free.<\/p>\n\n\n\n

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Why a better diagonal pays off<\/h4>\n\n\n\n

The diagonal is part of every optical path. A standard mirror with 90% reflectivity and moderate flatness compromises light transmission and sharpness on every eyepiece you own; a high-quality diagonal restores that performance to your entire set of eyepieces.<\/p>\n\n\n\n

For whom yes and for whom no<\/h3>\n\n\n\n