Today we going to discuss how to focus with DSLR in order to get a tack sharp photo.
This video by Phil Steele gives a good introduction to five different focusing techniques.
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Personally, I always set my focus point on center point, focus ( half press ), compose, than only press down the shutter. Other than that, you must hold the camera firmly to avoid shaking that will cause image blur and ensure that shutter speed is fast enough.