The 3mm Orion Edge-On Planetary Eyepiece is high powered making it great for detailed viewing of the moon and planets. The flat field design ensures sharp focus all the way to the edge, and fully multi-coated optics give you bright, sharp images.
I am very pleased with the over all performance of the 3mm Orion Edge-On Planetary Eyepiece especially for its edge to edge sharpness, comfortable eye relief and wider field of view with both an 8" SCT and smaller 480mm refractor. It rates similar to other higher priced eyepieces that I have use. The quality of the optics is very good for its price and I found that it is great for "flushing out" faint moons of Saturn or splitting double stars. Over all I found it a very useful high power eyepiece to have on hand and would recommend it to anyone.