On Fri, 21 Jan 2000, Paul Tierney wrote:
> I take photos of fireworks, i.e. large scale display fireworks.
>
> Exposure time is the difficulty. I get good results from an OM2. The rule
> of thumb is to use the aperture which is the nearest reciprocal to the film
> speed, e.g. if the film speed is 100, the reciprocal is 1 / 100 which
> equals 10, so the aperture used is the nearest: f11.
Erm, the reciprocal of 100 is 0.01. Should the formula be 1000/ASA?
That doesn't work either, since it would give a bigger aperture for
faster film (~5.6 for 200 ASA). How about film speed/10? Better, but
that gives a 2 stop smaller aperture for 1 stop faster film, which
doesn't sound right to me.
--
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