Ok, I'm a little confused. How can f2.8 = f11? I do understand f-stop, basically the number= the number of times that size opening could fit into the overall lens opening. i.e. f11 means the opening at that setting is 1/11th of the total possible, it would fit into the maximum opening 11 times. (larger f-stop number= smaller opening= greater DOF)
But that raises it's own question for me....Isn't the f-stop then a particular percentage of ONLY that particular lens or similar lenses? The answer is obviously yes, so then you can not directly compare f-stop between lenses unless they are VERY similar. That's something of a revelation for me....and I've been taking photo's for decades.....
Guess I'm just not too into the technicalities of photography...(that's odd for me, I'm pretty anal)
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