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I've seen dramatic changes in the star test between a fully cooled and partly cooled scope. You can think you've got a lemon then check again at midnight or so and see very even images.
If the ronchi lines are straight with just 2 or 3 lines showing, and no astigmatism is visible when you roll through focus, you're probably somewhere better than 1/4 wave which is all you can expect from a mass produced sct. I'd be happy with that scope.
Tony
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