Re: Workable HIE Speeds

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 10 May 99 at 10:28, Ian D Wilson wrote:

> I've always found Laurie White's rule of thumb for sunny days to be
> incredibly useful: 1/125s at f/11 (or equivalent) with a 25 red filter. 
> This sets the nominal ISO rating of the film at about 64 in sunshine,
> which is pretty workable for wide-angle to medium telephoto lenses.

A method that allows a a more general use: the Sunny Sixteen Rule.

At f16, you need a shuttertime of 1/ASA, providing bright sunshine.

With a #87C and an effective ASA of 12, this becomes f16 @ 1/15s, or 
f8 @ 1/60s, in my case which translates to a bracket of f5.6-11.  

--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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