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Increasing exposure for transparences

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    davro49mo
    davro49mo  12 United Kingdom
    10 Jul 2002 - 7:41 PM

    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.

    D Robinson.

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    Pete
    Pete Site Moderator 1318442 forum postsPete vcard ePz Advertiser England96 Constructive Critique Points
    11 Jul 2002 - 9:14 AM

    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.

    sinargee
    sinargee  12245 forum posts
    17 Jul 2002 - 2:56 PM

    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.

    doctorsid
    doctorsid  12 United States
    21 Jul 2002 - 2:23 AM

    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.

    Colin_A
    Colin_A  1232 forum posts
    30 Jul 2002 - 7:01 PM

    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)

    Phoenix
    Phoenix  131871 forum posts
    2 Aug 2002 - 1:34 PM

    Personally I find how I expose the shot depends on the film. I tend to rate my usual film selection as follows

    Film ISO
    ------ -----
    Velvia 50
    Provia 100F 100
    Provia 400F 400
    800 + 1 sttop push
    1600 + 2 stop push
    2500 + 3 stop push
    Astia 100
    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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