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.
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.
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.
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.
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:
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:
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)
