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Thread: α7S ll even offers impressive 14-stop latitude in the S-Log3 gamma setting.

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    α7S ll even offers impressive 14-stop latitude in the S-Log3 gamma setting.

    What does this actually mean, and how would it affect the potential of proper 14 stop dr for the A7Rii camera?

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    Re: α7S ll even offers impressive 14-stop latitude in the S-Log3 gamma setting.

    It does not mean anything. DR is coupled to the ISO and is not a constant. Higher DR => larger pixels => A7s/A7sII.

    Why this does not happen with the A7/A7II is a mystery.

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    Re: α7S ll even offers impressive 14-stop latitude in the S-Log3 gamma setting.

    Quote Originally Posted by Vivek View Post
    It does not mean anything. DR is coupled to the ISO and is not a constant. Higher DR => larger pixels => A7s/A7sII.

    Why this does not happen with the A7/A7II is a mystery.
    Sorry, the above statement is totally incorrect. Smaller pixel sensors with same sensor size will have more DR than larger pixel sensor. So A7rII should have better DR than A7sII in theory.

    The statement 14 stop latitude refers to s-log3 gamma setting in video mode. Its the way video is handled at ends (of spectrum) of dynamic range. The more steps of latitude, the more smooth the video appears in harsh lighting.

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    Re: α7S ll even offers impressive 14-stop latitude in the S-Log3 gamma setting.

    Quote Originally Posted by sven View Post
    Sorry, the above statement is totally incorrect. Smaller pixel sensors with same sensor size will have more DR than larger pixel sensor. So A7rII should have better DR than A7sII in theory.

    The statement 14 stop latitude refers to s-log3 gamma setting in video mode. Its the way video is handled at ends (of spectrum) of dynamic range. The more steps of latitude, the more smooth the video appears in harsh lighting.

    Thanks for the info.
    Could you please share a source where this is explained? TIA.
    With best regards, K-H.

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    Member karlfoto's Avatar
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    Re: α7S ll even offers impressive 14-stop latitude in the S-Log3 gamma setting.

    I am sure everyone will see this soon enough. Let us see what it means in reality though.

    http://www.dpreview.com/articles/766...-ii-and-a7r-ii

    Some comments from diglloyd

    http://diglloyd.com/blog/2015/201509...yLossless.html
    http://www.archifoto.com.au
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    Re: α7S ll even offers impressive 14-stop latitude in the S-Log3 gamma setting.

    AFAIK - The SLog-3 gamma settings refer to a flat image profile for video capture. Because it's not a raw format, it's compressed and baked as it comes out of the camera in 8 or 10bit color. the Slog3 is Sony's great compressed format for retaining high dynamic range for proper grading in post. It's an established compression algorithm that post software can apply a basic grade to on import. It would be great if they will provide the profiles to the A7R2 to use it too, (but doubt it).

    It has nothing to do with still photography which save raw files.
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