Tonight I was imaging this newly-discovered comet and I dragged my little reflector out on the off-chance I might be able to see it. And I could see the comet despite less-than-perfect dark adaption and the faintest flush of moonlight creeping into the sky! Very excited. It was right at the limit of vision, showing as a roughly circular diffuse patch about 1-arcminute in diameter. There was no sign of any central condensation. The seeing was quite poor and it was very faint - I found I couldn't hold it for more than a second or two at a time. 4.5" f8 reflector, 21mm eyepiece (43x). I've attached a rough eyepiece sketch (reflector view, rotated 180-deg).
Worth a look if you've got dark skies and preferably a bigger scope! It's the brightest comet in evening skies at the moment, very well placed for southern viewers. Latest visual observation has it at m1=10.7. But remember, that's for a diffuse object reported at 3-arcminutes diameter, nothing like a mag 10.7 star! The comet may reach mag 7 or brighter later in the year if it is confirmed as a 'return visitor'. I think the north get the best of it at its brightest though.
Funny, high mag 10s seems to be about the limit for my scope with diffuse comets, although I've seen a few fainter, highly-condensed ones. But I can see globular clusters with given magnitudes of well into the mag 11s, and I've been able to make out a few mag 12+ galaxies with this scope.
There are a couple of morning comets currently brighter than mag 10, C/2012 X1 (LINEAR) and C/2013 R1 (Lovejoy) but the Moon is inhibiting views at the moment. Also in the morning, C/2012 K1 (PANSTARRS) is brightening, currently reported in the mag 11s.
Cheers -