Roy,keep practising.I have this lens,and I have taken some very sharp images.I have not,as yet,used a tripod,I am waiting until I use the converters.I have found it takes sharper images than the 300F4 and much better than the Sigma300F2,so keep going and and I am sure that you will be be happy with it.All my shots have been taken handholding and I am not the steadiest of people.
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