If you dont wear glasses, and dont mind the 50 deg FOV, these are the best plossls for the money out there. Excellent edge to edge sharpness, good contrast, and brightness, with zero negative aspects when used in my 80mm F6 WO refractor. I bought the set of 15mm, 11mm, and 8mm and all are HIGHLY RECOMMENED with the only reservation being the 8mm has very short eye relief due to the nature of the plossl design.