On 3/13/2012 1:01 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?
No. The exposure is as shown in the EXIF. With bright central subject and much
darker background, evaluative metering
doesn't get it right, at least in holding highlights in a red or yellow flower.
I could, of course, have spot metered,
but seldom think of that.
> If so, does the -2.33ev on this camera close up the aperture or speed up
> the shutter speed? Or both?
Huh? This is a full function DSLR. As it happens, it was on aperture preferred
at f11 for DOF, so the camera adjusted
shutter speed and ISO for correct exposure. But It could have been on Program,
Shutter Speed preferred or Manual to get
the same exposure. And I could have had Auto ISO on or off, and can set the
upper limit for it. Heaven knows what full,
"smart" Auto might have done, as I don't think I've ever used it. Might even
have nailed it by using some back light
mode. :-)
>
> Inquiring minds want to enquire...
On 3/13/2012 6:35 AM, Jez Cunningham wrote:
> Confusing. Either it wasn't full daylight or the exif speed and aperture
> were without compensation. Do you know what the dials for speed and
> aperture were set to? Does the exif show that, or the adjusted numbers
> after dialling in compensation?
> thanks
> A slightly confused jez
How did we get off on sunny-16? Virtually all the light is back lighting
through the translucent petals. There is a tiny
bit of direct sunlight on the lower left and a few spots on the leaves.
Sunny-16 is actually an incidental light setting, relying on the relatively
stable light of mid day sun. Like any
incident reading, it only works for reflected light shots.
I shot at -1 1/3, -1 2/3 and -2 1/3 EV. It's not really possible to see tiny
areas blown in one channel on the LCD
display, so I bracketed. The lowest exposure turned out to be the one to hold
the reds. I brought up the overall
brightness of the petals, without losing red highlights, and left the
background dramatically dark.
> 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.
You get the CrackerJack prize. Almost all transmissive back light.
Properly Exposed Moose
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