A scroll of mail from Mike Johnston <[EMAIL PROTECTED]> on Wed, 28
Feb 2001 16:51:10 -0600
Read it? y
>Len wrote:
>
>> Mike, I have to take exception to your statement. Photographers do
>> understand EV relationships and the relationship between aperture and
>> depth-of-field.
>
>
>Statistically, most don't.
What statistics? If you're talking in terms of technical knowledge
for everyone who owns a camera, then no, because most cameras are
point'n'shoots with no user control. If you're talking about SLR
owners, then those with manual cameras *have* to be aware of it, while
those with automatic cameras may or may not be.
For those who want to know about EV as a function of Av, Tv, ASA:
EV=Log2(AV^2/AV)+log2(ASA/100)
make of that what you will. :) Someone may have an intuitive
knowledge of the relationship but still find the above confusing.
There's another equation for Av, Depth of Field, Hyperfocal distances,
etc, which I don't know by heart but again you can learn a lot by
looking through the viewfinder and stopping down.
dave
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