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Hi Grant. I have 3 zoom lenses and one fixed focal length lens. The three zooms are 28-90, 35-80 and 80-200 and the fixed is 50mm. All the zooms are around f/4 to f/5.6 and the 50 is f/1.8 None of the zoom lenses do a particularly good job, although the 35-80 probably does the best job. They are all achromatic lenses so I get the dreaded blue "ring around the star". The 50, although still and achro, doesn't show anywhere near the chromatic aberation the zooms do, plus I'm able to get a sharper image more easily. The 50 f/1.8 is a relatively inexpensive lense, so maybe consider a 50, and if you can afford it, something in the 135 f/2.8 and a 2X teleconverter. I found the zooms a real pain in the but to get good focus on, plus I had to be very careful if I reversed direction in my focus I didn't shift my zoom.
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