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G'day Mike,
While I can't offer any help (because all my lenses are Canon Ultrasonic Zoom) I will be very interested in any answers to your valid questions. You may recall I started a thread about a blue flaring I got in a photograph and after asking people what it was, it turned out to be chromatic abberation. It raised its ugly head again a few nights ago when I tried to use that same lens (Canon 75 - 300) to see what kind of image I would get if I just zoomed in on Jupiter. I picked up Jupiter and 3 moons alright but the CA on the over exposed planet was incredible. It was like looking through a wobbletronic with a very dodgy Hyugens ep.!!
I wonder if there is an easy way to test camera lenses before you buy them? What could you take a picture of that would enable you to see any defects? Remembering that it's unlikely the shop would let you take the lens out of the store.
Peter.
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