I have now experimented with my (Nik) camera to see how it behaves:
- if I'm in S then the speed is fixed and the exposure compensation will
move the aperture.
- if I'm in A then the aperture is fixed and the exposure compensation will
move the speed.
- if I'm in P then the camera moves along the pre-programmed curve
according to the real EV (light) level +/- the exposure compensation.
- if I'm in M then the speed and aperture are fixed and the exposure
compensation does nothing.
The EXIF correctly shows the real aperture and speed, after the exposure
compensation has done it's work, and it also tells me what compensation was
applied (even in M mode).
So the other variable remaining (in the understanding of sunny-16 (or
whatever) versus the optimised exposure) is the metering algorithm.
Under-exposing by 2.33 stops is relative to whatever the Can 60D metering
mode in use _thinks_ it should be to give mid-grey (14% or 18% or whatever
the current thinking is). I guess matrix metering, ESP, or any other clever
system can all have different opinions...
cheers
jez
> > On 13 March 2012 14:26, Chuck Norcutt<chucknorcutt@xxxxxxxxxxxxxxxx>
> wrote:
> >
> >> Exposure is actually 3 stops above sunny 16. At ISO 200 sunny 16 would
> >> call for f/16 at 1/200. Adjusting shutter speed to 1/250 takes care of
> >> -1/3 stop. Adjusting the aperture for an additional -2 stops would
> >> take f/16 to f/32. Instead we have f/11 for a 3 stop exposure over
> >> sunny 16. Conclusion: It wasn't full daylight out there.
> >>
> >> Chuck Norcutt
> >>
> >>
> >> On 3/13/2012 4:01 AM, Jez Cunningham wrote:
> >>> Yeah, deep reds :-)
> >>>
> >>> Interesting exposure data: f/11, 1/250, -2.33ev.
> >>> What does it really mean? f/11 and 1/250 (ISO200) is more-or-less
> >> sunny-16.
> >>> So I guess that's what the figures would be WITHOUT exposure
> >> compensation.
> >>> Do you agree?
> >>>
> >>> If so, does the -2.33ev on this camera close up the aperture or speed
> up
> >>> the shutter speed? Or both?
> >>>
> >>> Inquiring minds want to enquire...
> >>> Jez
> >>>
> >>> On 13 March 2012 01:54, Moose<olymoose@xxxxxxxxx> wrote:
> >>>
> >>>> We put some cyclamens in a shady part of the garden this year. This is
> >> the
> >>>> furthest out toward sunny country and caught
> >>>> some back light last week. We'll see what happens as the sun gets
> >> higher.
> >>>>
> >>>> All you out there who hesitate to use exposure compensation might note
> >>>> that even -1 2/3 was not enough to hold all red
> >>>> color detail at 100%. This -2 1/3 EV shot caught it all.
> >>>> <
> >>>>
> >>
> http://galleries.moosemystic.net/MooseFoto/index.php?gallery=Home/Garden_2012&image=_MG_5665oof70.jpg
> >>>>>
> >>>>
> >>>> Hold That Red Moose
> >>>>
> >>>> --
> >>>> What if the Hokey Pokey *IS* what it's all about?
> >>>> --
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> >>>>
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