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Lineair curve Sony A7r underexposure issue

ChrisM
When I switch from film curve "standard" to "lineair" with the Sony A7r raw files, the images become quite heavily underexposed. Exposure drops with about -1ev.
I always switch to the lineair film curve to use my own tonal curve in the curve tool. Film standard is almost always too contrasty to my taste.
I have noticed the flatter exposure with other cameras, but with the Sony A7r the drop is extreme.
Has anyone noticed this? I assume it is a bug. It is easily worked around with the exposure slider, but still, it is not expected behavior.

regards
Chris
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Comments

4 comments

Date Votes
  • paintbox
    Does it with my Nikon D3 as well.
    I don't sweat it. I just use another curve if linear doesn't cut it.
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  • Drew Altdo
    [quote="ChrisM" wrote:
    I assume it is a bug.


    What makes you think this?
    Linear curves will often drop exposure significantly, as no camera exposes for a linear curve but a film curve. I'd be interested in seeing a support case from you with some details as, with my files here, despite the drop in exposure I see no error that would indicate a "bug".
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  • ChrisM
    [quote="Drew" wrote:
    [quote="ChrisM" wrote:
    I assume it is a bug.


    What makes you think this?
    Linear curves will often drop exposure significantly, as no camera exposes for a linear curve but a film curve. I'd be interested in seeing a support case from you with some details as, with my files here, despite the drop in exposure I see no error that would indicate a "bug".

    Hi Drew,

    My experience with the choice of a "lineair" film curve as opposed to the "standard", is as follows:
    -I select the film curve "lineair", I edit the tone curve, and this is not at all an extreme edit, just raising the mid-tones to get correct approximate exposure level back, and opening up the shadows. Then I save both the lineair film curve and the curve tool edit as a preset that I apply on import. Doing it this way with several Pentax and cameras worked fine, overall exposure was generally maintained, but highlights protected, and shadows opened up.
    Doing this with the Sony A7r now, does not work: the drop in exposure is such, that I need to add +/- 0,65 exposure correction to get to overall correct exposure (comparing to use of the film curve "standard").
    I can save +0,65 ev in the preset, but this complicates things a bit, as I like to be able to change the preset back on images that work better with default CO1 settings. Any edits made to the exposure level are overridden this way when changing back and forth between the two presets.
    That's why I raised this question.

    regards
    Chris
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  • Drew Altdo
    If you'd like to create a support case and provide a file we'd be happy to take a look.
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