Slippery Slope: The Concave Form

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Originally Posted by BlueStreak

I make use of the concave form in my reflector telescopes, one Newtonian, the other Maksutov Cassegrain.

The concave form is a wonderful thing.

Your comment is interesting because the task of designing telescopes calculates the concave form from the side view, not from the focal point. How do you use your telescope? Where is the audience?