> Kodak 400-ASA colour negative film was exposed at wide-open
> lens stops of f-1.4 or f-1.8 depending on the lens being
> used; exposures of light-coloured rocks such as sandstone or
> siltstone were typically 5 minutes long, and for darker rocks
> such as coal or mudstone they were 7 or 8 minutes long. I
> bracketted most exposures by a minute either way, thus taking
> three shots of most scenes. The film was processed normally,
> with no special 'pushing' or exotic chemistry.
Not much point bracketing +/- 1 minute in an 8 minute exposure !
For night work (moonlight) I normally use 4, 8, 16 - that's +/- 1 stop.
...Wayne
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