05-04-2011, 10:44 AM
Read the OP's post agin. he has no issues regarding IQ, his issue is with the Sony 70-400mm lens not focussing fast enough for his use.
This is not the OP's fault, nor something unknown. The Sony 70-400mm just is not that fast a focusser. That does not have to be a problem for everyone, but for the OP's purpose it is.
Does this have anything to do with RAW converters? No. Does it have to do with what camera I have or do not have? No.
Just has to do with which lens is best suited for a task. Lenses are much more important than which SLR body one uses.
And of course, some camera bodies are better at AF tracking than others. Canon and Nikon are very good at AF tracking. The lens has to be capable, of course.
This is not the OP's fault, nor something unknown. The Sony 70-400mm just is not that fast a focusser. That does not have to be a problem for everyone, but for the OP's purpose it is.
Does this have anything to do with RAW converters? No. Does it have to do with what camera I have or do not have? No.
Just has to do with which lens is best suited for a task. Lenses are much more important than which SLR body one uses.
And of course, some camera bodies are better at AF tracking than others. Canon and Nikon are very good at AF tracking. The lens has to be capable, of course.