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DSLR focus advantage is that it takes short exposures of a time frame nominated by yourself EG... 2 second exposures...but what it does it gives you some stats and graphs to give you precise focus...something that is impossible to do visualy no mater how good you think you may be.
So yes you still take some short exposure's which you could just do manualy but you get specs to back that information up.
I should take a screeny next time.
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