Learning Photography [Was: Web weirdness]
djk at tobit.co.uk
Thu Jun 21 09:33:35 BST 2007
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)?
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