August 23, 2014, 05:40:27 AM

Author Topic: DxO reviews Sony A7s: king of low light photography?  (Read 17328 times)

dilbert

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DxO reviews Sony A7s: king of low light photography?
« on: June 17, 2014, 05:51:25 PM »
http://www.dxomark.com/Cameras/Compare/Side-by-side/Sony-A7S-versus-Canon-EOS-5D-Mark-III-versus-Nikon-D800E___949_795_814

DxO give it a low light score of 3702, which bests the 1DX (2786) and 6D (2340). Not unsurprising given the much lower MP of the sensor.

Is the A7s now the king of low light photography?

Dylan777

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #1 on: June 17, 2014, 06:49:15 PM »
Another DxO scores... ::) I do look forward to hand on the A7s, low light shooting will be fun.

Photo below taken at 20,000ISO from the X, might not be an ideal lighting condition, but photo doesn't look bad :P
« Last Edit: June 17, 2014, 06:57:40 PM by Dylan777 »
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rs

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #2 on: June 17, 2014, 07:17:06 PM »
12 bits per pixel, 13.2 EV dynamic range? That's even more far fetched than Nikon's 14 bit, 14.3 EV stats
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Dylan777

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #3 on: June 17, 2014, 07:53:03 PM »
12 bits per pixel, 13.2 EV dynamic range? That's even more far fetched than Nikon's 14 bit, 14.3 EV stats

You just have to trust DxO ;D
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cpsico

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #4 on: June 17, 2014, 09:08:45 PM »
http://www.dxomark.com/Cameras/Compare/Side-by-side/Sony-A7S-versus-Canon-EOS-5D-Mark-III-versus-Nikon-D800E___949_795_814

DxO give it a low light score of 3702, which bests the 1DX (2786) and 6D (2340). Not unsurprising given the much lower MP of the sensor.

Is the A7s now the king of low light photography?
I am waiting see real world pictures, dxo rates the d800 at approximately 2900 which any one who has seen the files knows its not that good at high ISO. I think the a7s will be amazing 12800 or slightly higher

neuroanatomist

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #5 on: June 17, 2014, 09:30:50 PM »
12 bits per pixel, 13.2 EV dynamic range? That's even more far fetched than Nikon's 14 bit, 14.3 EV stats

Far fetched?  Sony claims the a7S delivers 15.3 stops of DR.  Seems there are lies, damn lies, statistics, then there's Sony. 
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tayassu

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #6 on: June 18, 2014, 05:36:42 AM »
I really do not understand the test method of DxO. I can't comprehend how the crappy-at-high-ISO-D800 can score higher in Low-Light ISO than the 1DX...  :o Would somebody be so kind and explain this to me?
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bdunbar79

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #7 on: June 18, 2014, 10:16:22 AM »
I really do not understand the test method of DxO. I can't comprehend how the crappy-at-high-ISO-D800 can score higher in Low-Light ISO than the 1DX...  :o Would somebody be so kind and explain this to me?

Basically they normalize the 36MP image to 8MP and the 18MP image to 8MP, so no sh*t you get better noise performance, probably with additional mathematical (non-realistic) extrapolations. 
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tayassu

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #8 on: June 18, 2014, 10:25:50 AM »
So they do downsampling until the camera they want to be better is better...  :o don't know.... sounds strange, but is not subjective at all  ;)
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Mt Spokane Photography

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #9 on: June 18, 2014, 11:46:01 AM »
So they do downsampling until the camera they want to be better is better...  :o don't know.... sounds strange, but is not subjective at all  ;)

Its one of those situations where a comparison is not really possible.  Using their method, a high MP body will be much more likely to have a higher score, but the high MP is not the whole story.
 
I like high mp bodies so I can crop and still have a good image left, and at low ISO's, the Sony sensor is good.  that's assuming that I'm willing to buy a $5,000 Zeiss lens that can produce those results.  In any event, with a ordinary lens, the results will be better than with a low mp sensor.
 
At high ISO levels, when you crop, the noise comes into play, and the image can look really poor. 
If they cropped the images to 8mp, the results would be a disaster, so here is no ability to do severe crops at high iso's.
Its not really possible to do a single comparison that tells the whole story, DXO tries to simplify the results, and many think that their numbers are the whole story.

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #10 on: June 18, 2014, 12:09:39 PM »
So they do downsampling until the camera they want to be better is better...  :o don't know.... sounds strange, but is not subjective at all  ;)

Its one of those situations where a comparison is not really possible.  Using their method, a high MP body will be much more likely to have a higher score, but the high MP is not the whole story.
 
I like high mp bodies so I can crop and still have a good image left, and at low ISO's, the Sony sensor is good.  that's assuming that I'm willing to buy a $5,000 Zeiss lens that can produce those results.  In any event, with a ordinary lens, the results will be better than with a low mp sensor.
 
At high ISO levels, when you crop, the noise comes into play, and the image can look really poor. 
If they cropped the images to 8mp, the results would be a disaster, so here is no ability to do severe crops at high iso's.
Its not really possible to do a single comparison that tells the whole story, DXO tries to simplify the results, and many think that their numbers are the whole story.

Well, I don't.  ;)
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dilbert

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #11 on: June 18, 2014, 12:15:28 PM »
So they do downsampling until the camera they want to be better is better...  :o don't know.... sounds strange, but is not subjective at all  ;)

No.

They are using the case where you are using both cameras to print out an image of the same size as their rationale.

They've been downsampling for as long as they've been doing sensor reviews.

The significance of that is that an 8MP image fills an A4 page at 300dpi.

So their "normalisation" is "downsize to fit on a piece of paper that people will print on at home."

That seems like a perfectly sensible thing to do to me.

So what does it mean? It means that the image taken with the D800e will look better when you print it out on your A4 printer at home than if you used the 1DX. Or for your magazine or...

neuroanatomist

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #12 on: June 18, 2014, 12:40:27 PM »
So what does it mean? It means that the image taken with the D800e will look better when you print it out on your A4 printer at home than if you used the 1DX.

IF you're at low ISO, and IF you have the right lens, and IF the autofocus and frame rate are adequate for your subject and IF...   

So what does it mean?  Not much...
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bdunbar79

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #13 on: June 18, 2014, 01:01:54 PM »
So they do downsampling until the camera they want to be better is better...  :o don't know.... sounds strange, but is not subjective at all  ;)

No.

They are using the case where you are using both cameras to print out an image of the same size as their rationale.

They've been downsampling for as long as they've been doing sensor reviews.

The significance of that is that an 8MP image fills an A4 page at 300dpi.

So their "normalisation" is "downsize to fit on a piece of paper that people will print on at home."

That seems like a perfectly sensible thing to do to me.

So what does it mean? It means that the image taken with the D800e will look better when you print it out on your A4 printer at home than if you used the 1DX. Or for your magazine or...

So just because of all of that, you can jump to the conclusion that it has better high ISO performance?  In other words, it doesn't mean much.
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tayassu

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Re: DxO reviews Sony A7s: king of low light photography?
« Reply #14 on: June 18, 2014, 01:15:56 PM »
So they do downsampling until the camera they want to be better is better...  :o don't know.... sounds strange, but is not subjective at all  ;)

No.

They are using the case where you are using both cameras to print out an image of the same size as their rationale.

They've been downsampling for as long as they've been doing sensor reviews.

The significance of that is that an 8MP image fills an A4 page at 300dpi.

So their "normalisation" is "downsize to fit on a piece of paper that people will print on at home."

That seems like a perfectly sensible thing to do to me.

So what does it mean? It means that the image taken with the D800e will look better when you print it out on your A4 printer at home than if you used the 1DX. Or for your magazine or...

I still don't understand. The 1DX's image should be getting better also, and it is proof that it is at full res, so what?
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