{"id":34142,"date":"2025-11-17T13:22:10","date_gmt":"2025-11-17T12:22:10","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34142"},"modified":"2026-08-25T15:11:41","modified_gmt":"2026-08-25T13:11:41","slug":"william-optics-90-125-zenith-prism-cat-51-wifd","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-90-125-zenitprisma-cat-51-wifd\/","title":{"rendered":"William Optics 90\u00b0 1.25\u2033 Zenith prism Cat 51 WIFD"},"content":{"rendered":"

William Optics 90\u00b0 1.25\u2033 Zenitprisma Cat 51 WIFD: comfortable and upright viewing with your Cat 51 WIFD<\/strong><\/h2>\n\n\n\n

This William Optics zenith prism is the visual complement to the Cat 51 WIFD. It bends the light 90 degrees, allowing you to look comfortably into the eyepiece from above, and it presents the image upright: you'll see birds, landscapes, and the moon exactly as they appear outdoors.<\/p>\n\n\n\n

The BaK-4 prism has a dielectric coating that keeps light transmission high and reflections low. The included 2 to 1.25 inch adapter and ring clamp firmly and scratch-free mount the prism onto the WIFD focuser.<\/p>\n\n\n\n

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Why an erecting prism on an astrograph<\/h4>\n\n\n\n

The Cat 51 was built as an astrograph, but with this prism and an eyepiece, you have a compact spotting scope and travel binoculars. Two instruments in one case.<\/p>\n\n\n\n

Featured accessories<\/h3>\n\n\n\n

Combine with a 1.25-inch low-power eyepiece for the maximum field of view.<\/p>\n\n\n\n

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