On 25 Nov 2002 at 15:13, Bill D. Casselberry wrote:

>  Nah - Wheatfield's right, just three
> 
>  1) a means to focus  
>  2) a way to set an aperture
>  3) a way to set a shutter speed

I'd say a means to initiate the exposure is a pretty necessary control, it's a 
long time since photographers has to use a lens cap as shutter.

Rob Studdert
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