ISO 100 Dynamic Range Test - A7R II vs A7 II

Discussion in 'Sony Alpha E-Mount Cameras' started by Amin Sabet, Aug 14, 2015.

  1. Amin Sabet

    Amin Sabet Administrator

    Aug 6, 2011
    This is a straightforward test. Both cameras shot at 1/3s, f/4, ISO 100 with a controlled high dynamic range scene.

    RAW files for download: A7RII-A7II-DR.zip

    Compare those two RAW files in your processor of choice, or check out my conversions below.

    Suggested method for viewing comparison photos: Maximize browser window, and then click each photo of interest to open the full-resolution version on a new browser tab. Toggle between tabs to compare full-resolution shots at matched sizes.

    A7II Lightroom CC (2015 1.1) -5EV:

    20594935811_801f8fd42e.

    A7RII Lightroom CC (2015 1.1) -5EV:

    19965780364_7001eca1f5.

    A7II Lightroom CC (2015 1.1) +5EV:

    20588373375_ef8f09872e.

    A7RII Lightroom CC (2015 1.1) +5EV:

    20400376108_ef0b0ac28a.

    A7II Capture One Pro (8.3.2) -4EV:

    20562078496_65abbe9df2.

    A7RII Capture One Pro (8.3.2) -4EV:

    20400335580_216ff143db.

    A7II Capture One Pro (8.3.2) +4EV:

    20588316075_1cae172f9c.

    A7RII Capture One Pro (8.3.2) +4EV:

    20562080326_a0c40b9602.


    As you can see that the monitor highlight detail clips similarly for both cameras when the files are pulled, and the recoverable shadow detail is similar for both cameras when the files are pushed. Thus, for all practical purposes, these cameras have similar dynamic range.
     
    Last edited: Aug 21, 2016
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  2. addieleman

    addieleman Passionate amateur

    Nov 13, 2012
    Netherlands
    Ad Dieleman
    Thanks a lot Amin. If there is a difference in sensitivity between the two cameras, it's at least very little: I made Lightroom do an auto-adjust and it comes up with settings that are very close to each other for both raws.

    I lifted the shadows to look at noise in the dark parts and to me the A7RM2 file looks a bit cleaner when resized to a height of 4000px (which comes down to the A7M2's native resolution). Not something that makes me run out the door to get an A7RM2 but there is a difference. It seems the A7RM2 has a trick up its sleeve whereby it probably improves its noise performance compared to the A7(M2) at ISO 640 and above; see this for instance. I'm curious if you'll notice that too.
     
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  3. Amin Sabet

    Amin Sabet Administrator

    Aug 6, 2011
    Hi @addieleman@addieleman - thanks for your comment. I agree that there is a touch more for the A7RII here if you look very closely - it recovers a bit more of the text on screen, and the shadows look a bit cleaner on an image level (at matched output size), but it's not enough to affect my buying decision one way or another. I'm expecting less than half a stop DR difference here when DxOmark does their thing.
     
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  4. robbie36

    robbie36 TalkEmount Veteran

    488
    Nov 21, 2014
    Yes, this definitely confirms what I found. There is no inherent magic in terms of DR or iso performance from the BSI sensor in the A7r2 against what is already pretty much class leading A7ii in this area.

    Where the A7r2 starts to excel against the A7ii is in areas where the A7ii was lacking. In particular, C-AF at high shutter rates (including the eye-af or not).

    I would like to say I had some test shots to show you but unfortunately my test subject failed to achieve the high speeds he was dressed up for and I was expecting through my camera settings....

    cas.
     
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  5. Amin Sabet

    Amin Sabet Administrator

    Aug 6, 2011
  6. ggibson

    ggibson TalkEmount Regular

    154
    Sep 1, 2011
    It looks pretty similar for the most part to me, although the princess chair color is one area where I see the biggest difference. The A7II looks to be getting a little bit better color in some of the shadows than the A7RII.
     
  7. jeffmurray

    jeffmurray TalkEmount Veteran

    246
    Dec 18, 2014
    Hobart, Australia
    Jeff
    I'd agree with the findings discussed above - although I cannot do specific comparisons camera to camera. Looking at my series of photos taken on my site - from the Canon 5D2, 7D, 5D3, A7R, A7S and now A7RII; the back lit sensor is not achieving significantly better results. However it is 42mp - so maybe size for size I should be happy - and I am. The shadow recovery is great although noisy compared to my Canon's - the focus in good light with long lenses, the bracketing and 4k video are all a big plus for me.

    Robbie's model is perfect for the job - I hope you got a release from him ;-)
     
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