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Message: <blockquote data-quote="OwenM" data-source="post: 1270371" data-attributes="member: 63408">Getting back to the off-topic sub-topic:I'm not Frank, but in spite of what I consider fairly similar performance overall, I could differentiate between the Razor, Meostar, and DCF SP in a matter of seconds. Not in use necessarily, but by doing or improvising a star test(and as long as I didn't get cheese in my eye). The Meostar has a field flattener, and the SP uses aspherical lens elements, while the Razor has neither. They look very different when defocusing off-axis on a pinpoint light source.Could only tell because I've had a couple of Razors, and use SPs and a Meostar daily. Outside of that, I'd probably be lost, since that's about the extent of the brands and models I'm familiar with.</blockquote>