General presentation of eyepieces
Eyepieces are the essential complement to any astronomical instrument. They are the ones that ensure the enlargement of the image, the optical tube being just a simple light collector. The image produced at the focal point by a telescope or a refracting telescope is tiny. To be able to observe it with the eye, it is therefore necessary to enlarge it with a magnifying glass: the eyepiece.
You should always adapt the magnification to the star you are trying to observe: a high magnification to observe the planets, a lower magnification to observe deep sky objects. Equally important is to adapt the magnification according to the conditions of transparency and turbulence in the sky, it is useless to magnify too much when the conditions are bad, the images will not be better. Better a small, sharp image than a large, blurry, hard-to-focus image.
Features of the Sky-Watcher 80 ° range
Sky-Watcher offers an astonishing variety of wide-field eyepieces at a very attractive price. With a complex design of 5 to 7 lenses and 80 ° of apparent field, the Sky-Watcher Wide Angle is a very good alternative for those who want to benefit from a large viewing area with their instrument. Each lens has a multi-layer anti-reflective treatment for excellent light transmission.
The 3 or 4-group lens optical design corrects for field distortions and chromaticism and accommodates all types of instruments (reflector, refractor, and retro-reflector) with a 31.75mm sink focus system. or 50.8 mm. Take advantage, with 80 ° of apparent field, for longer observations on a non-motorized instrument, the object travels the field of your eyepiece 2.5 times slower than an eyepiece open at 50 °.
User comfort is also enhanced with at least 14mm eye relief. This means that the image remains comfortable up to a distance of 14 mm above the eyepiece: this is an important detail for people who wear prescription glasses, who will be able to keep their glasses making the most of the offered field. through the eyepiece.
The range includes 3 eyepieces in 50.8 mm (30, 20, 15 mm) and 2 in 31.75 mm (16 and 11 mm). They have a retractable windshield and a 28mm thread to fit filters in the 31.75mm format.