Quote:
Originally Posted by traveller
+1 for the ED80 Triplet.
It has better colour correction than a doublet, shorter FL so easier on the guiding, plus it has a focal ratio of f/5 which cuts down imaging time.
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This does not cut down imaging time. Only a larger aperture in mm cuts down image time to get the same faint objects.
But, indeed a triplet wins over a doublet if you are a real pixel peeper. Otherwise, rather get a 100...120mm ED doublet plus reducer.