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Question about EV


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#1
DocPit

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I'm reading a brochure which says, in part, "Now even at -4 EV it's possible for the autofocus to detect the subject..."  My understanding is that 0 EV would include any combination of f/stop and shutter speed that would yield correct exposure at a given ISO.  So, -4 EV would be 4 stops underexposed at a given ISO.  But, I'm still at a loss as to what is being said here. Perhaps the point is that in low light situations, where one might expect to have to focus manually, one now has the option to use auto focus?



#2
Merco_61

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EV 0 is a 1 second exposure at f/1.0. The -4 EV is actually -4 EV100 or -4 EV at ISO 100, the marketing people just have oversimplified a bit. There is a good article on wikipedia about EV. Exposure compensation is also expressed in EV, which can be confusing.