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  #9  
Gammal 2019-07-15, 06:46
cardazio
 
Medlem sedan: aug 2015
Inlägg: 748
pdahlen skrev: Det är troligen det hopp som Z6 gör i DR enligt DXOMARK, vilket skulle göra att DR är samma vid 800 som i ISO 200 för Z6, enligt kurvan ovan från Richard. Om detta är ett mätfel eller verklighet kan man fråga sig, men jämfört med D850 skulle det skilja ett steg enligt kurvan i högre ISO.
Gissar att det här med deras extra gain circuit att göra.

"The camera isn't entirely ISO Invariant but this is largely because the sensor features the Aptina-style Dual Gain design that Sony Semiconductor has been using for the past few years. This sees the camera use a second higher gain circuit in its pixels to reduce noise from ISO 800 upwards (at the cost of some capacity for dynamic range), where the camera is essentially entirely ISO-invariant.

This means that if you shoot Raw there's no advantage to increasing ISO above 800, for the same shutter speed and aperture, vs. brightening the Raw file yourself, which protects highlights for inclusion in post-processing. This way of working can afford you many stops of additional highlight detail at no cost to you, other than a dark image preview."

..

"In real world shooting, though, banding in shadows may decrease the overall usable dynamic range."

https://m.dpreview.com/articles/6705...ithout-caveats