Re: Sony announces A7R III and FE 24-105mm f/4 OSS lens today!
Steve Spencer wrote: Pixel Perfect wrote: Steve Spencer wrote:
Well, we'll see. I find it interesting that in the actual product page for the camera they are really claiming nothing and nothing nearly so concrete. The noise floor was already quite low on the A7rII, so I remain skeptical. If they did lower the noise floor I stick by my assessment that it won't increase DR more than about a quarter of a stop.
It might be a case of DxO shows 1 stop increase but the actual photographic real world DR is only 1/4 stop or so better. Read noise was already low, but things like how fast the ADC's are clocked can also introduce DR limiting noise which is why A9 DR is much lower. If they have cleaned up the whole pipeline it might not be unreasonable to see a larger than expected improvement.
Well, I don't think you are diagnosing the A9 correctly. It has lower DR, but only from ISO 100 to ISO 200 otherwise it does as well as the Nikon D810. If it was overclocking the ADC that is causing the lower DR, then I think you would see the effects at all ISOs. Instead, I think it is more likely to have to do with well depth, but we really don't know. What I think you are missing is that the A7r II has excellent DR and the only reason it falls behind the Nikon D810 and D850 is because they have a true Iso 64, whereas the A7r II only has a true ISO 100. Sony didn't address that issue, and the A7r III only has ISO 100 as well. It is not as if Nikon doesn't try to clean up their pipeline and Sony would have to be much much better at cleaning up the pipeline than Nikon if they are going to get anywhere near a 1 stop improvement. I still think a quarter stop is about max that we can expect and even to get that they will have to have a much cleaner pipeline than Nikon, which is a lot to expect.
According to a Sony engineer interviewed on Peta they have changed the micro lenses relative to the A7rII to get a bit more light. Also they claim to get more light by better unit-relfection tech on the sensor cover.
I simply don't believe that's not a trivial amount of light. BUT it might help with the residual sensor reflections that even A7rII gets...
Oct 25, 2017 at 11:30 PM
Previous versions of DavidBM's message #14230107 « Pre-orders open! Sony A7R III and FE 24-105mm f/4 OSS lens! »
