{"id":107517,"date":"2026-04-28T11:17:03","date_gmt":"2026-04-28T09:17:03","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=107517"},"modified":"2026-07-20T12:28:29","modified_gmt":"2026-07-20T10:28:29","slug":"tele-vue-plossl-40mm-1-25-eyepiece","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/televue-plossl-40mm-125-oculair\/","title":{"rendered":"TeleVue Pl\u00f6ssl 40mm 1.25\" - Eyepiece"},"content":{"rendered":"

TeleVue Pl\u00f6ssl 40mm 1.25\" : Eyepiece: classic TeleVue Pl\u00f6ssl eyepiece<\/strong><\/h2>\n\n\n\n

The TeleVue Ploessl 40mm is the specialized long model in the 1.25-inch series. The field stop is 27mm, the same as the 32mm; the apparent field of view is therefore narrowed to 43 degrees. You see the same piece of sky, but at lower magnification and through a narrower window.<\/p>\n\n\n\n

The reason to choose it is the combination of the lowest possible magnification with a very long eye relief of approximately 28 mm.<\/p>\n\n\n\n

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

The TeleVue Ploessl design<\/h4>\n\n\n\n

Four lenses in two groups are all a good Ploessl needs. Because there are few glass surfaces, transmission remains high and contrast is maximized: precisely the characteristics that matter for planetary and lunar observation.<\/p>\n\n\n\n

TeleVue T-type optics brought the design to the current level in the seventies, with tight manufacturing tolerances, multiple coatings, and blackened lens edges. You can see the difference compared to a standard supplied eyepiece right at the edge of the field.<\/p>\n\n\n\n

When 40mm is the right one<\/h4>\n\n\n\n

On slow telescopes like a Maksutov or Schmidt-Cassegrain, the 40mm provides the lowest usable magnification, with an exit pupil that stays neatly small: at f\/10, only 4mm.<\/p>\n\n\n\n

The long eye relief is also an advantage when observing with the whole family: children and eyeglass wearers find the image without searching. For fast telescopes, the 32mm is the better choice, with the same field and a wider window.<\/p>\n\n\n\n

In your telescope<\/h4>\n\n\n\n

In a telescope with a 1200 mm focal length, this eyepiece delivers approximately 30x with a true field of view of about 1.29 degrees. For your own telescope: true field of view = 57.3 x field stop divided by the telescope's focal length.<\/p>\n\n\n\n

The effective field stop of this model is 27.0 mm.<\/p>\n\n\n\n

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

A TeleVue 2x or 3x Barlow lens doubles or triples the magnification of any Ploessl eyepiece without any loss of quality; two Ploessl eyepieces plus a Barlow lens thus cover four magnification levels. Models 25 mm and larger also accept the Dioptrx astigmatism corrector.<\/p>\n\n\n\n

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