BST Flat Field Eyepieces

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