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Reciprocity times....

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    pikey
    pikey  10861 forum posts
    3 May 2006 - 12:43 PM

    Hi Folks...

    Had a bit of a hunt around with not much luck...Can anyone point me in the direction of a reasonably definative list of reciprocity times for various film types...

    Also..., I am after some technique info for calculating long exposures. Anyone know of any info I can lay my hands on ?

    Thanks if you can help....

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    3 May 2006 - 12:43 PM

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    johnriley1uk
    johnriley1uk e2 Member 1026 forum postsjohnriley1uk vcard United Kingdom4 Constructive Critique Points
    3 May 2006 - 1:27 PM

    You will find this sort of information in the manufacturer's technical literature - I have one example in front of me now "Kodak Professional Black and White Films". This gives the information you need for the appropriate films, and there will be similar Professional publications from Fuji.

    Alternatively, check out the data areas of the relevant manufacturers' websites.

    John

    Big Bri
    Big Bri  1315548 forum posts England
    3 May 2006 - 2:16 PM

    Any film in particular ? I have a data guide for fuji films (couple of years old now) (actually I just checked and its from 2001) which has all the info you could ever need for fuji films.

    pikey
    pikey  10861 forum posts
    3 May 2006 - 2:36 PM

    It was fuji I was after, Bri...their provia 100.

    I seem to be getting a bit of conflicting info. I have read that there is no adjustment required up to 128 secs...Just seems a bit odd that and contradictory to my general rule of thumb. Either that or emulsion technology has moved on a bit since I last shot film !

    Big Bri
    Big Bri  1315548 forum posts England
    3 May 2006 - 3:09 PM

    Provia 100F:

    1/4000 sec to 128 sec - None

    4 min - 2.5G + 1/3 stop

    8 min - Not recommended

    Hope that helps.

    pikey
    pikey  10861 forum posts
    3 May 2006 - 3:29 PM

    It's late...

    2.5 G ??

    I'll let you answer that tomorrow ; )

    Thanks, Bri and g'night....

    Big Bri
    Big Bri  1315548 forum posts England
    3 May 2006 - 11:11 PM

    I believe 2.5G is the colour correction filter you should use for a 4 minute exposure (reciprocity failure affects the exposure, but also the colour). Sorry I don't have more detail - I'm at work now and I left the data guide at home.

    pikey
    pikey  10861 forum posts
    3 May 2006 - 11:37 PM

    Thankyou Bri...

    Big Bri
    Big Bri  1315548 forum posts England
    3 May 2006 - 11:46 PM

    You're welcome. Swap you my supply of film for your 1DsMkII ?????


    Wink

    pikey
    pikey  10861 forum posts
    4 May 2006 - 12:37 AM

    You'd have to have a hell of alot of film ; )

    FrankThomas
    FrankThomas e2 Member 112762 forum postsFrankThomas vcard United Kingdom
    4 May 2006 - 1:25 AM

    Here's the info straight from the horses mouth

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