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Hi Kevin
I had a LP 90mm. First one I took back because of the colour error and trying to look at Mars or Saturn was a disaster. The second one had a better lens, but still the same colour error. Nice enough on clusters and nebulae but useless for photography or anything with high magnification. A rubbish scope, in my opinion.
I contacted Long Perng direct about the problems and they sent me a table of glasses used in the lens. It is FPL51 and NBM51, and is the same lens as used in the Megrez 88mm, but the colour problem is probably worsened by squeezing an extra 2mm out of it.
I sold mine.
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