Learning Photography [Was: Web weirdness]

Piers Cawley pdcawley at bofh.org.uk
Thu Jun 21 10:05:50 BST 2007

On 21/06/07, Dirk Koopman <djk at tobit.co.uk> wrote:
> Matt Sergeant wrote:
> > The basic equation is that to maintain the same
> > exposure, a full f-stop changed (which in this example was f-11 to f-8)
> > you will have to double the exposure time (from 1/400 to 1/200). Same
> > goes for ISO (i.e. to keep at 1/400 you'd have to change from ISO 200 to
> > ISO 400).
> This may be general ignorance on my part, or it could be a slip of the
> fingers, but surely it is f-8 to f-11 (on the grounds that f-8 is a
> *bigger* hole in the iris than f-11)?

Sounds plausible. I'm generally careful to write f/11 because then
it's a bit more apparent that f/8 > f/11.

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