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On July 5 Sirko Molau wrote about his NLC observations
> The exposure time is not so important: Both the 30 s and the 60 s
exposures
> show virtually no differences. Thus I will use 1 min exposures in the
future
> because the colour of the sky looks better.
If you use a tele lens and/or the features within a NLC display are
moving relatively fast, the 60 s exposure may be not appropriate.
While the colour may be ``better'' (probably more saturated), the
structures will become unsharp because of their changes. I suggest
to choose a film of higher speed to keep exposure times short (say
up to 20 s only). However, the problem does not occur in most stages
of the twilight when even an ISO 100/21 film is sufficient.
Generally it is better to try several shots (with exact timing).
Such documentary photographs cannot be repeated, so it is not the
moment to save film here.
Good luck!
Juergen Rendtel
JRendtel_at_aip.de
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