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I looked at the ES when I was looking for a Mak-Newt and they seemed pretty basic on a spec comparison with the others. For example, the secondary obstruction on the ES is 32% compared to 26% for the Skywatcher MN190, this impacts contrast. Short focal length at 731mm vs 1000mm. Practical visual power for the ES is 360x verses 500x for the Skywatcher. However, the ES is lighter, and costs less. If you have the money and the mount capacity then the Skywatcher or the Intes Mak-Newts are the real performers. I believe the Intes are custom order only these days.
Last edited by glend; 19-09-2015 at 06:08 PM.
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