in melbourne to be honest my experience is you need 8 or 10", if you're on the edge of the city the C5 will be fine - a C6 isn't much of an upgrade
you can prob barlow the 7mm to give roughly 160x, on the C5 use it as is
is your diagonal 1.25" or 2"
if you're thinking of going C8 then keep the ed80, it will complement the C8 for quick looks & quick cool down
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