On 12/30/2019 2:39 PM, Mike Gordon via olympus wrote:
Nattering Nabob of Nullity or perspicacious pragmatist, Moose writes:
<<So many exposure control aids, histograms, flashing lights, zebras, etc., are
derived from the JPEG that one becomes suspicious. Yup, I use them, and they are
useful, but not entirely reliable.
It is odd that this has not been corrected in firmware. It clearly can be
done! There is a way to tweak the settings for Sonnie that Zebras closely
parallel the raw files, but it isn't perfect. CHDK and Magic Lantern (hacked
firmware) allowed RGB or luminance histo/zebras based on raw data for several
years now.
Last I checked only the red dot company allowed for that. As I've learned the
hard way as well as cautionary advice from Moose, a color channel (esp red
flowers) can easily be clipped with a normal looking luminance histo or zebra.
R = Y + 1.403V' One can clip at V=127, i.e. at Y=77 (only 30% brightness).
Green channel more difficult to saturate, so I have read.
You are off in color country I don't understand. Yes, I can look up the definitions, and they make logical sense - but I
have NO Idea what they MEAN, when in front of a subject with my camera(s).
A simpler formulation: With sun, and bright natural subjects, the red channel will blow WAAAY easier than you think.
Think -1.33 EV, and bracket lower, if you have the chance.
Circumstances, such as background, make a big difference. The best exposure for these red Salvias, against dark
background, turned out to be -4 2/3 EV.
Custom button to set raw RGB zebra on half press would solve the issue, Mike
Y'all let me know when I can do that. :-)
Exposed Moose
--
What if the Hokey Pokey *IS* what it's all about?
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