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When you are told to increase the exposure when photographing a white subject does this also apply to colour transparences. I would have thought you needed to give less exposure otherwise surely the whites will be burnt out. I understand increase to be i.e from f5.6 to f4. Please can anyone give advice on this subject.
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You are right to think that increasing the exposure would make something lighter, but your whites won't be burnt out. The reason for this is that all exposure meters look at the subject and adjust the exposure so it will turn out an average tone. In photography that's a mid grey. So when you photograph something that's white the meter will automatically underexpose to make it grey, and that's why you have to overexpose to take it back to white.
The main thing to remember when exposing transparency film is not to overepose. Overexposure will result in washed out slides. Yes when shooting negative film the old maxim expose for the shadows and process for the highlights for B&W film holds good. Also remember there is only a third of a stop either side of the correct exposure that is tolerable with slide film.
It is probably best to expose every slide at 1/3 under... no matter what the subject. Proove it to yourself... Shoot a roll of ISO 100 slides and set your meter at asa 80 (I know that it=s not a 1/3 stop but you will get very nice rich slides that will have details you can bring out in printing if needed. Issue 3 of www.photographicage.com has a lot of articles about slide film in it.
To underexpose slide film by a 1/3 of a stop can give good results but the ISO needs tobe higher
(125 ISO not 80 ISO for 100 ISO film)
Personally I find how I expose the shot depends on the film. I tend to rate my usual film selection as follows
Provia 100F 100
Provia 400F 400
800 + 1 sttop push
1600 + 2 stop push
2500 + 3 stop push
Sensia 100 100 for portraiture
125 for anything else
Incidentally, I only use astia for portraiture, were I using it for anything else, I'd rate it at 125
Likewise were I to use Provia 100F or Velvia for portraiture (unlikely in both cases) id likely rate them at 80 & 40 respectively
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