Nice lens. Do not know what advise Chris and Roy have given you so will probably be repeating (or disagreeing!) with what they have said. For top quality use a sturdy tripod and shoot a static subject, focus manually, stop down to about f16 and use a low ISO like 100 or 200. A remote control is useful or use the self timer on 2 second delay and perhaps use mirror lock up too. For flowers a bright but overcast day works best. Movement and very shallow depth of field are the main problems. If you have to shoot hand held up the ISO to ensure a high shutter speed as camera shake is very noticeable with macro. I am far from an expert on macro but hope that helps.
Last edited by miketoll; 11-11-08 at 20:25.
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