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Sometimes, f2.8 is needed. It really depends on what type of photography you do. The 70-200 @ f2.8 for modelling/portraiture, etc, works very well imho. Beautiful bokeh. If you have a f4 lens, but must use f2.8, there's nothing you can do about it. If you have a f2.8 lens, but want to use f4, you can stop down. It's better to have the ability, than not imho.
Dave
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