Thom Hogan's review of the A7/A7r

Started Mar 10, 2014 | Discussions thread
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Tim Devine
Senior MemberPosts: 1,105Gear list
Re: Thom Hogan's review of the A7/A7r
In reply to Erik Magnuson, Mar 11, 2014

So the net of this conversation is that DxO Analyzer is flawed in that it doesn't mimic what might be realistic if someone used an actual raw converter. To which you gave ACR/Lightroom as an example (since Thom appeared to be using it), even though it may or may not represent what might be possible if you look at the gamut of raw conversion software that is available.

I will go so far as to say that Thom believes that based on his experience with the carmeras and ACR, that ISO 200 is the optimal ISO.  I'm just not sure that's any more "real" than DxO's measured data.  ACR would be one datapoint, and it would be good to have someone corroborate Thom's findings even with ACR.  I don't use ACR or Lightroom, so it's something I can't personally do.

I find my a7R performance better at ISO 100, but who knows...


Erik Magnuson wrote:

Tim Devine wrote:

DxO makes DxO Optics and DxO Optics Pro. They aren't theory, they are actual raw converters, not so unlike ACR/LR.

Does DxO guarantee that DxO Optics Pro can deliver the full DxOMark sensor DR to an image file? Of course not: for one thing DxOMark DR is only based on grey, not colors.

DxO profiles the lenses with each camera and creates profiles for the lenses and the cameras. If anything, I think DxO was gathering all this data for use in their raw software and they decided to start the whole DxOMark thing to put that data to other uses.

Yes, but what can be measured with DxO Analyzer is not necessarily going to apply to what DxO raw conversions can do. Just like what's measured by EPA for fuel economy (back calculated from emissions) does not mean you will get that mileage.

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