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With a bright suburban background, the view don't look too much different between a 12" and 16" . For example If the spiral arms or faint outer extensions of a galaxy are fainter than the local sky background, no amount of aperture will make them more visible. Larger apertures drag in sky glow as well as star light: the old adage `garbage in , garbage out' holds with telescopes too. If the seeing is very good the larger scope with good optics can reveal more planetary datail.
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