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Good information about macro photograpy can be found at http://www.ephotozine.com/article/Close-up-photography
or http://en.wikipedia.org/wiki/Macro_photography
Coming soon more on marco as experiments goes on !!!!
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However, there are some potential disadvantages with auto focus. It will fail when the subject is not in the center of screen or when shooting low contrast images and fast moving objects.
For example the image below where the subject (flower) is not in center of the screen. Simplify moving the subject into the center could have solved the problem but there will times then subject is not position centrally.
In picture below Subject is in the center but still the focus is on the background. Subject is blurred. This is incorrect image.
There are ways to solve the Auto focusing problem .. coming soon...stay tuned.