Learning Photography [Was: Web weirdness]

Dirk Koopman 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)?

More information about the london.pm mailing list