Quote:
Originally Posted by Lester
Hi David, a longer tube = more magnification. As the object is magnified, or spread it becomes dimmer. Hope that helps.
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Yes, David, in addition to the above, conversely, if you maintain the same length of tube and dramatically increase the size of the mirror, you get a faster scope with much brighter objects, as it can collect more light. This leads to what is colloquially know "aperture fever".
