1. make it little out from center ... not sure why but most of the people don;t like too center ... make be this is call rule/art ...
e.g. of crop one
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and original uncrop version
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2. make it center, for some situation e.g. some symmetry shot need to be center so minor cropping will help to do this
eg. this had been crop ~10% from left so to make it over center to make some attraction
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3. this is the one keep border me where I am using FF. to get same DOF of same magnification with APS-C body ... I just need to crop (FF 1.6:1 ~= APS-C 1:1 and bigger magnification will have less DOF this had discuss @http://liewwk-macro.blogspot.com/2008/10/what-depth-of-field-dof-you-have-while.html
not only the magnification but as the diffraction concern, I normally use bigger aperture (smaller F number) to shoot bigger magnification to maintain the sharpness so I do lost more DOF while shooting bigger magnification as compare to APS-C (but actually I got the similar frame picture)
e.g.
shot ~3 :1 without crop
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shot with 1:1 and crop close to ~3:1
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so should I corp ? or should you ?
it is depend personal preference ... I do not prefer to crop but stack so I shoot multiple focus and stack it together as discuss @ http://liewwk-macro.blogspot.com/2009/12/macro-pp-why-i-need-to-increase-macro.html
and you ? just shoot and enjoy whatever way you enjoy the shooting and the output instead other concern ...
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