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p.6 #8 · p.6 #8 · Sony A7Rii compared with Sony A7R and Canon 5DSr | |
RustyBug wrote:
That would be good to see. Hopefully in a more "straightforward" manner ... changing only one variable (ISO), leaving the other aspects of exposure & lighting constant. Once we start making multiple variable "tests", then it really muddies the water, raising the results into more question than answer.
If one needs to do multiple tests regarding multiple aspects, so be it do them independently. THEN, after showing the individual aspects, you can "play" with multiple variables and folks can then see the synthesis possibilities ... but when you start off with multiple variables in your approach, it makes it kinda tough for folks to follow sometimes.
In this test, I'm also intrigued by the variance in the sky ... in the posted images (I can't open the raw), the sky in the 5DsR is only around 245-ish, while the A7R II is fully blown @ 255 (which could be anything from 255 to 255 + a gazillion). Here again, we are showing a degree of unequitable variance. If you think these are equitable @ ETTR, then simply desaturate them both and you see the difference more clearly. A sampled area of the triangular rock face on the right reveals 168 (A7R II) vs. 134 (5DsR) ... again, a significant variance on the order of magnitude @ yet again +/- another full stop.
For the OP ... I do appreciate the effort. It reminds me of some testing that I did quite some time ago ... and it got "picked apart". But, to be fair, the things that folks were pointing out about my method were indeed valid. Did that invalidate all aspects of my presentation ... "No." Did it require an adjustment in understanding to what we were looking at "Yes."
The test here is being presented as though it is equitable ... but on three different issues (exposure, tint, adjustment to ETTR) I see variation in the testing. I think it would be prudent (if you have the time / inclination) for a repeat of the test. Again, I appreciate the effort, but I think that we do need to (honestly) take the presentation and results with a (rather large) grain of salt ... which, since the A7R II was given more light than the A7R (although I only looked into the two @ A7R II vs. 5DsR @ lazy on my part), the perception that the A7R II is a quantum leap above the A7R ... well, that also falls into question, given the variances involved.
Thanks again, but I have to take this one as "swing and a miss" or a "foul ball" ... step in the box and take another swing at it. Looking forward to seeing you put this one in the field of fair play for everyone to chime in on @ redux.
Do I expect to see similar results showing the DR of the A7R II different from the others ... sure, but I think that in it's current form ... it may be exaggerated by virtue of all the synergistic effects from the variances. I mean, once we start talking about making 2^6 exponential changes to things, and then adding / subtracting, clipping, etc. well, that can really provide for some diff results through the wonderful aspect of numerical manipulation to those variances.
I realize that pride of authorship may continue to invoke a defense of your test (hey, we're all human here), but I do hope you'll take an honest revisit to your approach and look for the possible errors. The final aspect of all my tests in physics were ... here's all my data and findings ... now, here's all the ways it could be flubbed up or skewed en route (i.e. no such thing as a perfect test), including human error. That's just a part of good testing, to review where the folly's might exist ... grand or minute.
Thanks again for the effort.
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Can you have a look at this and tell me which of the two Sony files match the Canon file better?
http://static.timparkin.co.uk/onlandscape/SonyLakes/latrigg-hotel/rawdigger.jpg
I may be going data blind now but I'm sure it's the one I've used..
Tim
p.s. I'm uploading another article with more crops that show similar results including studio comparison. The Sony A7R and Sony A7Rii are odd. I'm not sure if it's sensor heating up but when the A7Rii actually records slightly less DR than the A7R (in imatest) but the shadows look better colour out of camera. Looking closer the A7R gets cleaner info (sharper edges) compared with the A7Rii. Overall I think the A7R actually has slightly cleaner shadows with more detail but you have to play with them more than the A7Rii to get to that nice detail.
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