I just bought a case of used equpiment and it included 13mm and 19mm Russell Optics super wide eyepieces. I wasn't expecting much from them as they were plastic and I presumed cheap eyepieces. I tried them out last night and they gave pretty good views. The vast majority of the field of view was sharp with some weakening toward the edges. I was not at all unhappy with them. Anybody else use these?