vision35 wrote in post #19219277
I better take the camera off auto ISO on sunny days. Both images taken 12 noon -3pm a turn your scalp red sunny day even with sun block.
I just looked at the data. I think the ISO is what is destroyed the image quality washing out and adding too much grain.
Very sure that ISO 100 and 200 could have been used.
Tamron SP 150-600mm F/5-6.3 Di VC USD G2 @600mm • 1/2500 • f/6.3 • ISO 1000
Tamron SP 150-600mm F/5-6.3 Di VC USD G2 @600mm • 1/500 • f/6.3 • ISO 400
By a sunny day without cloud above, the correct exposure - notwithstanding the specular reflections - is likely (and at max !) 100 ISO & f16 & 1/125 s (= 100 ISO & f6,3 & 1/800 s or 1000 ISO & f6,3 & 1/8000 s or 400 ISO & f6,3 & 1/3200 s) in jpeg mode ; and 100 ISO & f16 & 1/50 s (= 100 ISO & f6,3 & 1/320 s in raw mode) in raw mode.
So far, 1000 ISO & f6,3 & 1/2500 s as figured in the exifs means not only overexposed digital file but everlost burned highlights. And naturally even worse results with 400 ISO & f6,3 & 1/500è s.
A circular polarizer would have helped with the specular reflections on the turtles' shells but could not imho have adressed the automatic exposure errors in evaluative mode.