I have tried 3 more times with different surfaces at different distance. I also can point out I desaturated each image before taking a reading on the histogram. All tests performed on a tripod at 100 iso center metering wb set to daylight. There is a general trend but not much more than that. I think the amount of light and distance from camera play a big part in this combined with the camera deciding to jump up or down on readings in between. Looking though my camera settings dynamic range shadow corrections was set to auto if that might have some effect, I don't shoot jpg normally.
Thinking back to my A50 with modeling lights perhaps the flicker has some effect on metering? how much time does the camera meter for? Also with the a50 I had compared aperture priority in A setting to manual green button metering. On manual this necessitated I did not have the lens set to A because it would change the aperture as well as the shutter. I did use the A setting for Av mode.
Ks2 with M50 inside white room lit by outside cloulds at 1/3,1/2 sensitivity, grey concrete slab outside overcast, Rusted corrugated metal outside overcast, white washing machine outside overcast.
F2(85,85) 91,91,118
f2.8(100,105) 87,89,112
f3.5(105,105) 107,105,125
f4(125,125) 106,123,122
f4.5(130,140) 125,120,139
f5.6(140,140) 98,115,132
f6.7(140,140) 101,114,131
f8(145,130) 102,91,148
f9.5(140,135) 76,88,123
f11(135,130) 56,71,121
f13(130,125) 50,50,111
f16 (75,100) 44,44,82
f22 (100,100) 38,45,83
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