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Ezio. The asi120 has fairly small pixels and you should aim for about f19 - in combination with your scope you will only need a 1.5x Barlow - a 3x Barlow would give you 1/4 the sensitivity with no additional resolution. Even a 2x is a bit too much magnification. start off without a Barlow maybe
Last edited by Shiraz; 05-04-2013 at 11:56 PM.
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