{"id":34058,"date":"2025-11-16T15:12:12","date_gmt":"2025-11-16T14:12:12","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34058"},"modified":"2026-09-29T20:04:18","modified_gmt":"2026-09-29T18:04:18","slug":"william-optics-61-guidescope-guide-star-apo-blue","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-61-guidescope-guide-star-apo-blue\/","title":{"rendered":"William Optics 61 Guidescope Guide Star Apo Blue"},"content":{"rendered":"

William Optics 61 Guidescope Guide Star Blue: apo guides in blue<\/strong><\/h2>\n\n\n\n

The William Optics GuideStar 61 is an apochromatic guidescope featuring a 61 mm (2.4 inch) objective lens with FPL-53 glass. This glass delivers sharp, color-pure star points, and this very sharpness makes guiding more accurate: guiding software can determine the center of gravity of a sharp star more precisely than a blob. Made for guiding refractors with focal lengths from 700 to 1200 mm.<\/p>\n\n\n\n

The helical focus works via the dewcap: twist off the ribbed counterring, slide the cap until the star is sharp, then reattach it. At the rear is a extendable extension for extra focusing range. This version is blue, supplied with Vixen-style swastika and a carrying bag.<\/p>\n\n\n\n

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Also a mini-astrograph<\/h4>\n\n\n\n

With the readily available Flat61R flattener, the GuideStar 61 becomes a flattened photography lens for small sensors: a complete travel astrograph in addition to its work as a guider.<\/p>\n<\/div>\n<\/div>\n\n\n\n

Included<\/h3>\n\n\n\n