Another recommendation would be to purchase Bryan Peterson's "Understand Exposure" and Michael Freeman's "The Photographer's Eye."
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Sounds to me like you're using too wide an aperture, meaning too shallow a depth of field. Recommended reading: Byran Peterson's Perfect Exposure.
70-200 f/2.8L, 16-32 f/2.8L II, 100 f/2.8L Macro
need suggestion for extenders... should i go for "2x extender iii" to gain extra zoom for my 70-200 f/2.8L
or is it better to go for 100-400???