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Originally Posted by davidpretorius
To test Andrews comment of not being proven that the series 500 and gso are different. Have any of you guys had the same sized eye piece in both styles and noticed a big difference to warrant nearly 50% increase in price?
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I have the GSO 25mm and the 500 20mm. Believe me they are different. Different colour coating (GSO: green, 500: greyish blue). GSO also has better finish on the filter end (no chipping in the blackening/chrome, and threads run all the way to the edge), and also has soft foldable eyecups, not the harder plastic+rubber compound. The body of the GSO is recessed for focuser lock. But the main difference is in sharpness and contrast when you use it with your scope. At $39 the GSO plossls is superb value! Unbelievable really. Money well spent.
Remember that Lee is not an amateur (or pro) astronomer, so he only knows what his suppliers tell him.