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Made of high quality optical glass, the 1.25'' 16mm, 19mm & 27mm EF (EXTRA FLAT FIELD) eyepiece series is truly one of kind with a sharp, 60 Degree FOV with the 16MM, a 65 Degree FOV with the 19MM, & 53 Degree FOV when using the 27MM. Virtually free of pincushion and field curvature. Fully Broadband Multicoated optics bring out true color stars and sharpness. Air Spaced Blackened Lens Edges for enhanced contrast and brightness. Parfocal and smooth Twist Up eyecup, a nice feature for those who use eyeglasses. EF eyepiece series come with dust caps and Microfiber cloth. No Field Curvature or Pincushion effect. Air Spaced Blackened lens edges Fully broadband multi-coating All models are Parfocal Smooth twist-up eyecup
Check out this Cloudynights Review:
"I am impressed at just how "clean" the image is, with the background sky being black right up to the planet. With my 102mm/F7.75 doublet apochromat, bright stars show up as lovely jewels. Orange, white, or bluish white, all bright stars had nice saturated colors. Airy discs were perfectly round with no comet tails. I also saw an improvement in edge definition on f/6 scopes or longer."
-David Elosser, Cloudynights Reviews
Focal Length 12MM
60 Degree FOV.
5 Elements 3 Groups