Quote:
Originally Posted by Ukastronomer
It is a fact that the central obstruction results in degraded contrast from reflecting/sct scopes etc as compared to a refractor, pure Physics
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Depends on one's observing goals. For pure image quality at a given aperture, nothing touches an unobstructed optic. Period. However it's easy for other designs to be made big enough so that this disadvantage is more than compensated for through brighter images and higher resolution.