i used the a7r ii yesterday at night, just using street lighting and can confirm that at 6400 asa using exposures around 10th to half a second that there is a much more noise than i expected, i've reduced my highest usable asa to 1600...
Hi Adrian,
Thanks for the example. I'm wondering, given the 1/6th second exposure time, I assume you were shooting from a tripod. Why not use ISO 800- 1600 to begin with and increase exposure time? As e.g. earlier
tests by Jim Kasson have shown for the A7R , There is no quality gain (as expressed in higher Signal/Noise ratio) to be expected above ISO 800, maybe 1600, and until proven wrong, that assumption may also be valid for the A7R II. Just 'under-exposing' at ISO 800 and pushing in post-processing could already deliver higher quality.
But, an image starved of photons will always be noisy, due to photon statistics. So you'll get even better results by increasing the actual photon exposure for the shadows. And to remedy highlight clipping, just bracket, and combine in postprocessing.
The glare is hard to avoid with bright lights in the actual image area, but one can try to shield the bulging lens for all non-image-contributing lightsources.
Cheers,
Bart