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Archive 2014 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW

  
 
Dreamscape17
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p.3 #1 · p.3 #1 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


Should I sell my D600 and 5 lenses for the A7s? I do mainly landscapes, including astrophotography. On the D600 if I find ISO 3200 files to be really noise heavy after light editing. The DR at base ISO is basically perfect though, and I wouldn't be willing to give that up.


Jul 05, 2014 at 03:21 PM
snapsy
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p.3 #2 · p.3 #2 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


Dreamscape17 wrote:
Should I sell my D600 and 5 lenses for the A7s? I do mainly landscapes, including astrophotography. On the D600 if I find ISO 3200 files to be really noise heavy after light editing. The DR at base ISO is basically perfect though, and I wouldn't be willing to give that up.


The A7s will perform similarly to the D600 at ISO 3200.



Jul 05, 2014 at 03:41 PM
snapsy
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p.3 #3 · p.3 #3 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


thefoxeur wrote:
a crazy recover in the shadow : edited in ACR and some curve in Photoshop to remove purple color

ISO 100.

the Raw : http://www.sebastien-renard.com/pictures/DSC00540.ARW

the compare :

http://www.sebastien-renard.com/pictures/recovers.jpg

Sure you recover a lot of noise and loose some details , but the pictures was Black !!


Can you share your PP for this? When I load the raw into LR5 I'm seeing a lot of chroma noise and shadow tinting.



Jul 05, 2014 at 04:15 PM
thefoxeur
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p.3 #4 · p.3 #4 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


yes of course , you have a lot of noise ! it's crazy recover.

you can download my XMP setting for ACR here : http://www.sebastien-renard.com/pictures/testrecover.xmp.zip

and after I applied some curve on photoshop to remove red and green on shadow and Highlight

I repeat but it's a crazy recover !



Jul 05, 2014 at 04:26 PM
snapsy
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p.3 #5 · p.3 #5 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


thefoxeur wrote:
yes of course , you have a lot of noise ! it's crazy recover.

you can download my XMP setting for ACR here : http://www.sebastien-renard.com/pictures/testrecover.xmp.zip

and after I applied some curve on photoshop to remove red and green on shadow and Highlight

I repeat but it's a crazy recover !


Awesome, thanks. When I looked at your XMP at 100% in PS CC it matched what I was seeing in LR; the difference was in your downsampled version, which cleans up nicely relative to the 1:1 view. The A7s is not up to higher-density Exmor standards for base ISO DR but it's certainly the best balance in terms of extreme High ISO performance and base ISO, and that is a pretty big achievement.

For reference here are some shadow pushes on a D7000 (Sony 16MP Exmor, the best sensor in terms of ISOless available today) and a D800 (Sony 36MP Exmor). The biggest difference vs the A7s is that these other Exmors retain their color fidelity even at +5EV pushes, esp. for the 16MP APS-C and a bit less so for the 36MP FF, and thus don't require much in the way of PP for color/tone correction. This is most obvious when comparing shadow pushes of a color checker chart.

D7000 Orig
D7000 Up to +7EV in PP

D800 Orig
D800 +5EV PP



Jul 05, 2014 at 05:29 PM
thefoxeur
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p.3 #6 · p.3 #6 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


I'm agree it's why i will take the a7r in second body ! For shoot to 100iso to 800 iso


Jul 05, 2014 at 10:59 PM
thefoxeur
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p.3 #7 · p.3 #7 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


Interresing !! Live you in Vegas too ?


Jul 05, 2014 at 11:03 PM
Fred Miranda
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p.3 #8 · p.3 #8 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


thefoxeur wrote:
An other test with the mechanical , electronic and silent shutter , Dynamique range

The Raw : http://www.sebastien-renard.com/pictures/shutter.zip

http://www.sebastien-renard.com/pictures/SilentshuterDR.jpg



Thanks for posting these samples. The DR reduction when using the electronic shutter is quite dramatic.



Nov 08, 2014 at 12:24 PM
charles.K
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p.3 #9 · p.3 #9 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


+1
Very interesting comparisons!



Nov 08, 2014 at 06:31 PM
thefoxeur
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p.3 #10 · p.3 #10 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


You're all welcome , thanks for your comments !

I will post soon more pictures of what I do everyday , I really enjoy to use the a7s in all condition and a7r too.

I recently bought the 55mm Zeiss , Voigtlander 35mm 1.2 and 50mm 1.5.




Nov 10, 2014 at 03:48 PM
carstenw
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p.3 #11 · p.3 #11 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


Hmm, has anyone done a similar test for the A7? How does this work, i.e. why is the DR lost?


Nov 10, 2014 at 04:03 PM
Fred Miranda
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p.3 #12 · p.3 #12 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


carstenw wrote:
Hmm, has anyone done a similar test for the A7? How does this work, i.e. why is the DR lost?


The A7s's sensor was optimized for high ISO at the expense of DR at base ISO. That loss in DR should only be evident at ISO 100 but I have not be able to see it when comparing to my A7r. After the files are normalized, starting from ISO 3200 there is a noticeably increase in DR when comparing to the other A7 series cameras.

Aside from that, the real strength of the camera is shooting video using the Slog2 profile at ISO 3200.



Nov 10, 2014 at 09:15 PM
carstenw
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p.3 #13 · p.3 #13 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


I see, but the general optimisation for high ISO would be separate from this comment of yours, which is what I meant to refer to:

The DR reduction when using the electronic shutter is quite dramatic.



Nov 11, 2014 at 02:30 AM
Fred Miranda
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p.3 #14 · p.3 #14 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


carstenw,
The A7 does not have full electronic shutter and therefore can't be compared to the A7s in that regard.



Nov 11, 2014 at 09:53 PM
snapsy
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p.3 #15 · p.3 #15 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


Fred Miranda wrote:
Thanks for posting these samples. The DR reduction when using the electronic shutter is quite dramatic.


The DR differential between the electronic shutter and EFCS/full-mechnical is much less at higher ISOs and even reverses in certain conditions. Here are samples I took:

ISO 100, +7EV push, EFCS
ISO 100, +7EV push, fully electronic shutter

ISO 6400, +5EV push, EFCS
ISO 6400, +5EV push, fully electronic shutter

ISO 409,600, no EV push, EFCS
ISO 409,600, no EV push, fully electronic shutter



Nov 11, 2014 at 10:07 PM
Fred Miranda
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p.3 #16 · p.3 #16 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


snapsy wrote:
The DR differential between the electronic shutter and EFCS/full-mechnical is much less at higher ISOs and even reverses in certain conditions. Here are samples I took:

ISO 100, +7EV push, EFCS
ISO 100, +7EV push, fully electronic shutter

ISO 6400, +5EV push, EFCS
ISO 6400, +5EV push, fully electronic shutter

ISO 409,600, no EV push, EFCS
ISO 409,600, no EV push, fully electronic shutter


That is very revealing. Thanks for posting. I would not hesitate using fully electronic shutter are I mainly use the A7s for low light and very high ISO (from 3200 to 40,000)



Nov 11, 2014 at 10:28 PM
carstenw
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p.3 #17 · p.3 #17 · Sony a7s Topic [DR + HIGH ISO + RAW + compare 1dx] - REVIEW


Fred Miranda wrote:
carstenw,
The A7 does not have full electronic shutter and therefore can't be compared to the A7s in that regard.


Not directly, but I wonder if the A7 also suffers from DR loss with the EFCS enabled.



Nov 12, 2014 at 12:58 AM
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