{"id":107753,"date":"2026-04-29T17:15:52","date_gmt":"2026-04-29T15:15:52","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=107753"},"modified":"2026-08-23T15:08:18","modified_gmt":"2026-08-23T13:08:18","slug":"televue-big-barlow-2-2x-barlow-lens","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/televue-big-barlow-2-2x-barlowlens\/","title":{"rendered":"TeleVue Big Barlow 2\" 2x - Barlow Lens"},"content":{"rendered":"

TeleVue Big Barlow 2″ 2x : Barlowlens: barlowlens van TeleVue<\/strong><\/h2>\n\n\n\n

The TeleVue Big Barlow doubles the magnification of 2-inch eyepieces, making it the partner for large Naglers and Panoptics. With the included adapter, it also works with 1.25-inch eyepieces.<\/p>\n\n\n\n

This is how a 31 mm Nagler becomes an effective 15.5 mm with the exact same field stop: the same patch of sky, imaged twice as large.<\/p>\n\n\n\n

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

What a good Barlow does<\/h4>\n\n\n\n

A Barlow lens extends the effective focal length of your telescope, thereby increasing the magnification of any eyepiece inserted into it. Two eyepieces plus a Barlow lens thus cover four magnifications.<\/p>\n\n\n\n

The quality of the glass determines whether you get it for free or pay for it with contrast. TeleVue uses high-refraction glass with multiple coatings; the difference with the eyepiece alone is not visible in practice.<\/p>\n\n\n\n

Effect on eye distance<\/h4>\n\n\n\n

A classic Barlow lens slightly increases the eye relief of short eyepieces. This is welcome with a Pl\u00f6ssl: a 15mm with a Barlow has more comfortable eye relief than a standalone 7.5mm.<\/p>\n\n\n\n

If you want a magnification factor that has no effect on the eye relief or exit pupil, the telecentric Powermate is the alternative within the merk series.<\/p>\n\n\n\n

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

Combine the Barlow with the TeleVue Ploessls for a compact set that covers four magnifications. The eyepieces are parfocal, so switching requires minimal refocusing.<\/p>\n\n\n\n

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