Hi Screwdriverone,
Thanks very much for this advice (see below).
Quote:
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The ED one leaves the APO one for dead in my opinion, less colour fringing and much better views. For a cheapie, the 3x ED GSO is very good value. I havent seen any others in action, but these ones I have and thats my findings. Certainly, the quality jump on my Jupiter photos has indicated this from the 2.5 up to the 3x, easier to focus too.
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I was going to buy the APO 2.5x GSO barlow as I thought it (apochromatic) would be better than the ED glass 3x version however, your description Chris has persuaded me otherwise.
All the best from,
Glob.