"Rob Bradford" <rob.polymnia@[EMAIL PROTECTED]
> wrote in message
news:F56dncNhxrzo2C7anZ2dnUVZ8uWdnZ2d@[EMAIL PROTECTED]
> Lee.
>
> You have 3 things to adjust;
>
> 1. F stop
> 2. Shutter speed
> 3. Film speed , or ISO
>
> Change one, and you have to adjust one or both of the others to
> compensate, it's a trade off.
>
> Beware of upping the ISO too much as image quality will be affected.
>
> Rob.
>
To expand just a bit:
1. A Smaller f/stop (larger number) gives more depth of field. (Sometimes,
less depth of field is better)
2. A faster shutter speed stops motion more. (Blur can give the impression
of speed)
3. A lower ISO gives better image quality. (Grain can add a 'stark/gritty'
look to the picture)
Too general purpose guidelines:
A- The longest shutter speed that can be handheld is the inverse of the
focal length. IOW, If you are using a 50mm lens, you can handhold down to
1/50 second. For a 500mm lens, you can handhold to 1/500 second. YMMV.
B- The Sunny-16 rule: Set the shutter speed the same as the ISO. For
bright
sun, use f/16, for hazy sun f/11, open shade f/8, shade f/5.6.
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