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Question about Pushing and Latitude


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#1 Tim Nuttall

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Posted 01 January 2008 - 07:44 PM

Hi all,

I was shooting this past weekend using V2 5218, rating the film at 800 and shooting for a 1-stop push. I generally worked at an F4 and wondered if certain areas in frame read (using a spot meter) at between F0.5 and F1/1.4 split, would they expose black? I know the push increases the density but does it cut a stop of latitude off the toe with its increase in contrast?

Thanks and Happy New Year.
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#2 David Mullen ASC

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Posted 01 January 2008 - 08:08 PM

Sort of -- by underexposing one-stop, let's say, when rating 500T at 1000 ASA, you are essentially recording one stop less shadow information and one stop more highlight information. But then by pushing, that overexposure information is getting shoved into and beyond the shoulder more where detail can't form because you're reaching maximum density.

Plus there is an increase in base fog density from pushing that may not make the darkest areas as usable due to grain and fog.

However, you only underexposed by 2/3's of a stop, so if shadow information is three stops under the key, it's probably still visible, though slightly less well than if you had rated normally.
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#3 Tim Nuttall

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Posted 01 January 2008 - 08:18 PM

Thanks David.

This seems good then since I hoped those areas would expose black. Rating at 800 and spoting the grey card at F4, this will result in a 1/3 stop print down correct?

Thanks.

Sort of -- by underexposing one-stop, let's say, when rating 500T at 1000 ASA, you are essentially recording one stop less shadow information and one stop more highlight information. But then by pushing, that overexposure information is getting shoved into and beyond the shoulder more where detail can't form because you're reaching maximum density.

Plus there is an increase in base fog density from pushing that may not make the darkest areas as usable due to grain and fog.

However, you only underexposed by 2/3's of a stop, so if shadow information is three stops under the key, it's probably still visible, though slightly less well than if you had rated normally.


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#4 David Mullen ASC

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Posted 01 January 2008 - 08:39 PM

More or less, you are in somewhat of a grey zone since a one-stop push is never exactly one stop more density, plus your own exposing is often within a 1/3-stop margin of error. Remember that printing down 1/3 of a stop is only like 2 printer light points!
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#5 Tim Nuttall

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Posted 01 January 2008 - 08:44 PM

Thanks again David.

I suppose the background area I read at F.5 - F1.0/1.4 could be "printed" down to remove any detail in the telecine supervised transfer. Do you think its possible?


More or less, you are in somewhat of a grey zone since a one-stop push is never exactly one stop more density, plus your own exposing is often within a 1/3-stop margin of error. Remember that printing down 1/3 of a stop is only like 2 printer light points!


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#6 David Mullen ASC

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Posted 01 January 2008 - 11:37 PM

If you're trying to lose shadow detail you're more likely to ask them to darken the shadows, crush the blacks a little, while leaving the highlights at normal brightness. As you know, printing up or down is a photochemical term.
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#7 Tim Nuttall

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Posted 02 January 2008 - 06:37 PM

Thank you David.

If you're trying to lose shadow detail you're more likely to ask them to darken the shadows, crush the blacks a little, while leaving the highlights at normal brightness. As you know, printing up or down is a photochemical term.


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