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Originally Posted by Rastis
Whats the difference between the standard GSO 2 inch Barlow and the ED Barlow.
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I presume less false colour in the ED (like in ED80 apochromat vs 80mm achromat). I'd also expect it to have better treatment optically (coatings, edge/barrel blackening...) since its a more expensive model.
I just want someone to buy one and tell us what they are like really.
