On 27/09/2007, Charlotte Webb <charlottethewebb(a)gmail.com> wrote:
Spectators can be blurred beyond recognition. I've
done this a few
times. If you are good with photoshop or something similar you can
usually make bystanders and well-wishers look "incidentally out of
focus" rather than "deliberately anonymized".
—C.W.
When using a good camera, the bigger the aperture (the smaller the
f-number) the smaller the depth of focus. This also increases the
amount of light hitting the film, meaning you can speed up the shutter
speed.