Celestron 4 mm Omni Eyepiece

Celestron 4 mm Omni Eyepiece
  • Wide selection of focal lengths
  • Plössl optical design
  • Blackened lens edges
  • Multi-layer coating
  • Accepts 1-1/4 inch Celestron thread-in filters

Classic Plössl eyepieces in a contemporary design The Omni series provides various magnifications and a 2x Barlow lens. The Celestron Omni 4mm fits into any 1.25-inch focuser. The Omni Celestron eyepieces offers an inexpensive alternative to poor-quality accessories kit eyepieces: Plossl eyepieces with four-lens, symmetrical structure. Blackened lens edges prevent reflections inside the eyepieces and increase the contrast, the multi-coating on every lens allows good contrast and light transmission. In addition, each case is anodised twice to prevent reflections – refer to other manufacturers instead for reflective surfaces. The eyepieces are pleasantly light and offer a good field of view – although it is smaller than in the much more expensive eyepieces, there is absolutely no disturbing tunnel vision. You can screw the filter thread integrated into the eyepiece into any 1.25-inch filter, for example, to attenuate the light at the moon observation or use mist filter for deep-sky observation. A retaining groove in the receptacle prevents the eyepiece from the focuser from slipping and falling onto the floor when you turn the telescope and loosen the clamping screw. The Plössl design The Plössl eyepieces were among the first eyepiece constructions and go back to the Austrian optician, Simon Plössl, who developed it in 1860. The design has prevailed since the 1980s, as it can be produced with specialised techniques for an excellent quality. With around 50° apparent field of view, they are good, versatile eyepieces that can accompany you for many years. If you are looking for inexpensive eyepieces that are worth their money, the Celestron Omni eyepieces are a good choice. At focal lengths below 10mm, viewing distance can be somewhat low – especially glasses wearers can get a longer Oklaren focal length by combining it with the 2x-Barlow lens. The Barlow doubles the magnification, without changing the pleasant behaviou

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