Orion EF - Extra Flat - are modern glasses with a flat field, i.e. with reduced distortion, greater own field of view than offered by KE, PL or Super Ploessl glasses, FMC layers and a conveniently offset exit pupil ( eye relief ), and at the same time adjustable - withdrawable must eye ("twist-up").
The EF series includes eyepieces with 27 mm focal length (AFOV = 53 °, ER = 23 mm), 19 mm (AFOV = 65 °, ER = 18.5 mm), 16 mm (AFOV = 65 °, ER = 18 mm), 12 mm (AFOV = 60 °, ER = 15 mm) and 8 mm (AFOV = 60 °, ER = 10 mm).
Give up Kellnery and Ploessle and move to a higher level of image quality and viewing comfort. • focal length: 12 mm
• AFOV (own field of view): 60 °
• layers: FMC (optics fully covered)
• exit pupil offset: 15 mm
• filter thread: yes, 1.25 "(M28.5 x 0.6)
• eyecup: twist-up
• body: aluminum + rubber for a better grip
• casting standard: 1.25 "
• weight: 115 g 2 years
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