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Old 04-11-2009, 06:28 PM
bloodhound31
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Join Date: Aug 2006
Posts: 4,628
Quote:
Originally Posted by troypiggo View Post
The difference between f/2.8 and f/4 is one stop. That's double the exposure time for all the other setting remaining the same. But if you want to keep your exposure time the same at 30secs, you'd need to double the ISO. Like I said, the 5DII should handle that. Plus, keep in mind the exposures will be comparable to the f/3.5 you were using anyway. Plus plus, not many lenses are sharp as a tack wide open, so you probably could/should have stopped the 16-35 down to f/4 or so anyway. You might stop the 17-40 down to f/5.6 for sharper image? You'd need to test that. Playing with the ISO's is the solution, because you're locked in on max times, and you're going to be f/4 or f/5.6 or in between.
From what I saw using Humayun's lens a couple of weeks ago, one stop on the same ISO setting makes a HUGE difference. Plus, if I can gather the same amount of light in half the exposure time, I reduce my noise dramatically!

Or so I have been led to believe....or is it just that i don't get it?

Baz.
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