Extra flat (“EF”) optical design minimizes field curvature for flatter, non-distorted images.
For our US customers – http://bit.ly/2KOB9ex
8mm Orion EF Widefield 1.25″ Eyepiece – http://bit.ly/2KOBluh
12 mm Orion EF Widefield 1.25″ Eyepiece – http://bit.ly/2s3y8ju
16 mm Orion EF Widefield 1.25″ Eyepiece – http://bit.ly/2KR1lFb
19 mm Orion EF Widefield 1.25″ Eyepiece – http://bit.ly/2s3xt1g
27 mm Orion EF Widefield 1.25″ Eyepiece – http://bit.ly/2IFHZpN
As the name also implies, the fields of view of the EF Widefield Eyepieces are generously expansive to provide a comfortable, immersive view, whether you’re gazing at celestial denizens or land-based subjects. Of the five different focal lengths, the 8mm and 12mm EFs have a 60-degree field of view (FOV), the 16mm and 19mm have a 65-degree FOV, and the 27mm has a 70-degree FOV.
The machined, black-anodized aluminum housings feature a rubber grip band for easy handling, even while wearing gloves, and a slotted barrel to prevent slip-outs if the locking thumbscrew on your telescope’s diagonal or focuser should loosen slightly. The 1.25″ barrels are also threaded to accept an array of Orion 1.25″ filters. And unlike many wide-angle eyepieces on the market, each Orion EF Widefield Eyepiece sports a rubber-rimmed twist-up eyecup, which not only reduces intrusion of unwanted ambient light, but also helps position your eye at the optimal distance from the eye lens to allow visibility of the entire field of view. Eye relief (ER) varies depending on the focal length: the 8mm EF Widefield Eyepiece has 10mm ER, the 12mm has 15mm ER, the 16mm has 18mm ER, the 19mm has 18.5mm ER, and the 27mm has 23mm ER.
Shop our entire collection of Telescope Eyepieces here: http://bit.ly/2sbBVuq
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Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all. Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you.