Check the batteries. Most of the time when I have run into trouble with my 430 EX II, not so much my 580 EX II has been the batteries were low or lowish
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With the launch of the Nikon D4, such improvement like high ISO capabilities and advance video technology. Does the current 5Dmk2 still sufficient in today market? I'm seriously looking into getting one 5dmk2.
.... If I understood neuro's tech posts correctly, the DOF will be more shallow on FF for the same subject distance and framing.
I thought for the same subject distance, the Crop has more OOF blur, but for the same framing the FF has more OOF blur... this is because on the FF, you need to get closer to the subject, thus the ratio of you to the subject vs the subject and the background is larger, where as with the crop, you need to be further back form the subject for the same framing; and when you move back, the ratio of you vs the subject and the subject vs the background becomesless... and that ratio defines the amount of OOF blur.... , the larger the ratio, the more OOF blur is what I understood.