Quote:
Originally Posted by ErwinL
.........All the light coming from outside your aperture angle will be lost.......
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A 10" scope can only ever get 10 inches worth of light...much like a cookie cutter ...light is limited by the aperture of the mirror or lens....i.e. a cookie cutter can't gather pastry beyond its edge...angles simply don't come into it.
Hence I'm not sure what you mean by "aperture angle" as the wavefront from the sky is perfectly parallel to the telescope aperture (or "cutter" )