Learning Photography [Was: Web weirdness]

Matt Sergeant msergeant at messagelabs.com
Thu Jun 21 15:37:22 BST 2007

On 21-Jun-07, at 4:33 AM, Dirk Koopman 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)?

Yes, my bad. Automatic metering has spoiled me :-)

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