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for planet viewing i don't think APO is a necesity, long f/l will do it - i am lazy & don't like collimating - waiting for warm down so refractor is better for me - a 6" gathers alot of light , a 5" would still be very good- get osme good orthos for it
also i can fit it across the back seat of my wife's small 1.4L car - bid dob is much more difficult - i had a 12" & hated moving it
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