Exposure Compensation
Eyron
aperature reads say F9 .
But I need a lower F stop to limit depth of field.
Will minus 3 stops of exposure control alow this and give me a 3 stop larger
aperature?
Also what would my F stop be here?
Are there any drawback to use exposure compensation. ( ie noise etc.).
EEO
Gary Eickmeier
"Eyron" <od...@rogers.com> wrote in message
news:iDZWa.56671$hOa....@news02.bloor.is.net.cable.rogers.com...
> If I have a set shuuter speed (ie sync at 1/125 sec) and the correct
> aperature reads say F9 .
> But I need a lower F stop to limit depth of field.
> Will minus 3 stops of exposure control alow this and give me a 3 stop
larger
> aperature?
Yes - that is what "stop" means -
> Also what would my F stop be here?
I'm not sure, but you can just use either aperture or shutter priority AE
mode and run the other up or down and find out. If you are in shutter
priority mode, then increase shutter speed until you get the f-stop you
desire. If you go aperture priority, just set the aperture you desire, and
if there is enough range, the shutter speed will match.
> Are there any drawback to use exposure compensation. ( ie noise etc.).
You aren't talking about exposure compensation; you are just setting normal
exposure. There is no drawback to any set or range of exposure combinations.
Just the effects of high vs low aperture and high vs low shutter speed.
Gary Eickmeier
JK
Eyron wrote:
> If I have a set shuuter speed (ie sync at 1/125 sec)
> and the correct
> aperature reads say F9 .
So the camera is in shutter priority mode, or is it in program mode?
>
> But I need a lower F stop to limit depth of field.
> Will minus 3 stops of exposure control alow this and give me a 3 stop larger
> aperature?
First of all, -3 means 3 stops less exposure. In shutter priority mode,
this would close the aperture further, which is exactly the opposite
of what you want. So you neeed to to get to f3.5 or so to have much less
depth of field. Going with a +3 setting will give you less depth of field,
but your image will be 3 stops overexposed. What you really want to do
is set the camera in aperture priority mode, then pick around f2.8 or
f3.5 if you want shallow depth of field. The camera will then choose the
appropriate shutter speed, which in this case would be 1/1000th of
a second. If you have an slr, flash usually wouldn't work properly
at such a high shutter speed(since at high shutter speeds, the
shutter curtain is never fully open over the whole film frame or sensor)
In that case, you would want to lower the ISO rating the camera is set
at if there is room to do that. So if you lower the ISO rating by three
stops(ie from 400 ISO to 50 ISO), you can get roughly f3.5 at 1/125th
of a second exposure.
Joseph Meehan
much cross posting, it is considered bad manner. Some of the groups you
included have little to do with your digital camera.
You should be able to change the "film speed" on your camera. Lower it
to force a larger stop and less depth of field or raise it for more depth of
field. ND (neutral density) filters also work and they work on digitals.
--
Joseph E. Meehan
26 + 6 = 1 It's Irish Math
"JK" <JK9...@netcape.net> wrote in message
news:3F2C7003...@netcape.net...
Don Stauffer
two, while one stop difference is a factor of about 1.4 (or 0.7), since
exposure goes as f/stop squared. That is, going from f/5.6 to f/8 is
one stop difference, and would take a doubling of exposure time.
--
Don Stauffer in Minnesota
stau...@usfamily.net
webpage- http://www.usfamily.net/web/stauffer