I generally use mid priced to expensive eyepieces in my three scopes that range from a 6" f11 dob (1/6 PV optics), to a 12" f4 dob (unknown optics) to a 16" f4 dob (1/8 PV optics); all of them are Orion Optics UK. I'd generally use the last two with a paracorr. At my school we have a 8" f6 Skywatcher dob and I bought a Meade 15mm Plossl and a generic 2x barlow for use with the standard 10mm and 25mm offering. I have meant for a long time to compare these very cheap eyepieces with my own more exp