I can't decide between the lens cap of a 70-200/f2.8 or the cap of a 70-200/f4 IS. I assume the IS cap will do better at handholding since the lens diff is 1 stop but the IS picks up 3-4 stops. However, the f4 cap will not freeze motion as well as the 2.8 cap. What should I buy?
Also, should I turn off the IS when using its cap?
Lastly, will the smaller DOF of a crop affect my lens cap decision? I want the best Bokeh possible so this is a tough decision.







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