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Originally Posted by davidpretorius
so that practically no starlight will actually hit the spot because the secondary mirror at the top is in the way. you can see the spot when out of focus, but at focus, the spot is not there, so do not worry!
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Actually, NONE of the light will hit the center spot - its completely in the shadow of the secondary.
That spot you are referring to when out of focus is the shadow of the secondary.