Contrast ratio results for Sony a7RIII

Black
Contrast ratio	3059:1
Monitor model	Sony a7RIII
Submitted	24 Oct 2019 22:20 CEST, by 174.217..
Camera model	Sony ILCE-7RM3
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 4.9 s (Set EV to +2.3) Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.15 cd/m2
Luminance spread	0.23 cd/m2 (2 standard deviations)
Exposure value	–4.79 stops (aim for –2 to –3)
Exposure spread	2.76 stops
Area used for calculation	0.334 x 0.374
Camera settings	Exposure time: 1 ISO: 320 F-number: 4 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	473 cd/m2
Luminance spread	73 cd/m2 (2 standard deviations)
Exposure value	–1.85 stops (aim for –2 to –3)
Exposure spread	0.22 stops
Area used for calculation	0.334 x 0.374
Camera settings	Exposure time: 1/400 ISO: 320 F-number: 4 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0

The luminance values in cd/m2 are not very reliable, since camera sensitivities can easily differ up to 50% from their nominal value. Typically, the real luminance is 30% lower than this number. The area used for calculation is chosen such that it corresponds to a viewing angle of ±14° horizontally and ±10.5° vertically, which is equivalent to viewing the screen from a distance of about 1.5 times the diagonal size.

Unfortunately, there is a lot of variation in how cameras use EXIF settings. If photos from your camera your produce unusable results, try coming back in a few days. I review submitted pictures regularly and try to fix problems.