Learning Photography [Was: Web weirdness]

[Anne Laymond]

As a recap, may I confirm:
(and then we can move to the photogeeks ML :-) )

f11 (small aperture) -> f8 (bigger aperture)
eq
1/400s -> 1/200s
eq
iso 200 -> iso 400
eq
1 stop up

Google "stop down" to get all the answers you need


On 6/21/07, Piers Cawley <pdcawley at bofh.org.uk> wrote:
>
> 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.
>