Fuji Sensia 100 info anyone?

Discussion in 'Fuji' started by Duncan J Murray, Mar 30, 2005.

  1. Does anyone know the anwser to this question?

    What will be the resulting density of the film (for the three colours) if I
    expose normally for 18% grey at the rated ISO?

    I only ask so that I can make sense of the characteristic curves for the
    film, which are a bit useless if you don't know where 18% grey is meant to
    lie on it.

    Duncan.
     
    Duncan J Murray, Mar 30, 2005
    #1
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  2. Duncan J Murray

    Alan Browne Guest

    Just out of curiosity, why are you looking for this?
     
    Alan Browne, Mar 30, 2005
    #2
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  3. Well I'm just starting out with this film, and got hold of the response
    curve of from the Fuji website. If I know where 18% grey lies on the
    response curve, I can adjust the esposure to place the metered tonal range
    wherever I like on the curve - so if I meter from highlights, I know to
    increase the exposure by x stops. I know there are some general rules of
    thumb for slide film, but I thought it'd be nice to precisely work it out
    for myself.

    Thanks in advance.

    Duncan.
     
    Duncan J Murray, Mar 30, 2005
    #3
  4. Actually, I've just found out the anwser for myself from googling "ISO
    5800:1987" and then trudging through this article...

    www.largeformatphotography.info/ articles/conrad-meter-cal.pdf

    (which is very good by the way).

    I seems like Slide Film ISO is defined by... ISO = 10/(midtone exposure in
    lux-seconds). Therefore midtone exposure is 0.1 lux seconds for this ISO.
    This relates to Zone V metered exposure by -0.14 stops for Canon and Nikon
    cameras, and by 0 stops for Pentax and Minolta cameras (due to differences
    in metering). You can then look at the response curve of the Fuji film
    (pdfs are on fuji's website) to see that this exposure gives a density (for
    pentax) of 1.0 on their scale (arbitrary units, I think). You can then
    visually see on the graph that Zones VIII is right at the toe of the curve
    and zone III at the shoulder. In effect Zone VII should be used for
    highlights where there will some loss of detail (two stops above metered
    value). Basically you have a range of 5 stops with some loss of detail,
    more like 4 stops if you want to keep all the detail. 4 stops means +1 for
    highlights, metered value for medium grey, and -1 and -2 for shadows.

    I'll now approach Fuji Sensia 100 with this armoury of knowledge (and
    probably fail miserably)!

    Duncan.
     
    Duncan J Murray, Mar 30, 2005
    #4
  5. Duncan J Murray

    Alan Browne Guest

    I'm sure you'll do fine, but may I ask why you're so keen on the technical?

    If you just wanted to know how to expose it I would have replied:
    highlights at +1.7 to 2.0 or incident meter as is. The shaddows are
    indeed murky (at III or less). Fill flash if you can to lift them.

    Cheers,
    Alan.
     
    Alan Browne, Mar 31, 2005
    #5
  6. Duncan J Murray

    shesso Guest

    "This relates to Zone V metered exposure by -0.14 stops for Canon and Nikon
    cameras, and by 0 stops for Pentax and Minolta cameras (due to differences
    in metering)."

    minus 1/10th f~stop, huh?


    "Duncan J Murray"
     
    shesso, Mar 31, 2005
    #6
  7. Duncan J Murray

    Alan Browne Guest

    If you believe it, you see it. ;-)
     
    Alan Browne, Mar 31, 2005
    #7
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