{"id":107429,"date":"2026-04-27T13:38:53","date_gmt":"2026-04-27T11:38:53","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=107429"},"modified":"2026-08-23T15:06:49","modified_gmt":"2026-08-23T13:06:49","slug":"televue-paracorr-type-2","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/televue-paracorr-type-2-big-3-coma-corrector\/","title":{"rendered":"TeleVue Paracorr Type 2 BIG 3\u2033 \u2013 Coma Corrector"},"content":{"rendered":"

TeleVue Paracorr Type 2 BIG 3″ : Coma corrector: comacorrector voor parabolische Newtons<\/strong><\/h2>\n\n\n\n

The Paracorr BIG is the 3-inch version of the Type 2, developed for large Dobsons and astrographs with a 3-inch focuser. The larger clear aperture prevents vignetting where the 2-inch version hits its limits.<\/p>\n\n\n\n

The correction is the same: parabolic mirrors up to f\/3, with a factor of 1.15.<\/p>\n\n\n\n

\"TeleVue<\/figure><\/figure>\n\n\n\n

Why a Newtonian telescope has coma<\/h4>\n\n\n\n

A parabolic primary mirror images only the center perfectly. Toward the edge, stars acquire a comet-like tail: coma. The faster the mirror, the smaller the sharp center; at f\/4, that is only a few millimeters.<\/p>\n\n\n\n

No eyepiece can fix that, because the error originates in the mirror. A corrector in the light path can, however. The Paracorr corrects the coma and leaves the rest of the image unaffected.<\/p>\n\n\n\n

For large mirrors and large sensors<\/h4>\n\n\n\n

With Dobsonians from about 500 mm aperture upwards, the fully illuminated field circle of a 2-inch corrector becomes tight, certainly with eyepieces like the 21 mm Ethos. The 3-inch aperture solves that.<\/p>\n\n\n\n

For photography, the BIG serves sensors up to full-frame format, provided the focuser and the rest of the optical train maintain the 3-inch standard.<\/p>\n\n\n\n

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

The Paracorr is the permanent partner of Ethos and Nagler eyepieces on fast Dobsons: especially with 82 and 100-degree fields of view, you see the edge, and therefore the coma. With the corrector, stars are point-like right into the corners.<\/p>\n\n\n\n

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