Baz, if you do decide on a QHY5L2/ASI120, aim for f19 so a 2.5x Barlow is the go. With the Neximage5, aim for about f11, so a 1.5x is needed. A 3-4x will be a match for the DMK618, but too much for either of these chips with your scope.
Last edited by Shiraz; 03-04-2013 at 10:07 AM.
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