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I took some unguided, tripod-mounted snapshots of Comet Lemmon last night, with the 5D Mark III and the new 70-200mm f/2.8L II IS USM, at 200mm with the Canon 1.4x II teleconverter, yielding 280mm at f/4. 10 seconds at ISO-3200. At web resolution, they look great. If you zoom in, you'll notice trailing. At f/4, there was /some/ vignetting, but, not enough to be objectionable, and, the stars seemed to not tend towards seagulls on the outer edges. Admittedly, I didn't have a very close look, but, seemed to be fine to my eyes.
I'll post some images in this thread when I get home later tonight.
H
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