Go Back   Steve's Digicams Forums > Digicam Help > Studio Lighting, Flash & Other

Reply
 
Thread Tools Search this Thread
Old Oct 23, 2005, 5:42 PM   #1
AMG
Senior Member
 
Join Date: Mar 2004
Posts: 144
Default

Hi all, I have posted under another thread and was told to post here, so in a nutshell, I have pics using fill flash outdoors ( in AV mode ) where the background is underexposed. I believe I know why, but would like to know for sure, my thoughts are once I've told the camera that I am using the flash, it must set the shutter speed accordingly to allow for a proper exposure of the subject even with the minimal flash output. I suspect fill flash works perfectly only when the subject is backlit or at the very least darker than the background. when the background and subject are equally lit, then using fill flash will always underexpose the background more of a side effect of the shutterspeed being increased automatically. I had taken pics one after the other with fill flash and without, and the pics without flash have the background exposed well, as opposed to the fill flash pics. Can someone let me know if I am right, and more than that, how to achieve the proper result when using flash outdoors when the subject is already well lit. thank you. I have already received some help but I am exploring all avenues here. using canon elan 7e with 420 EX.
you can see the pics under this thread

http://www.stevesforums.com/forums/v...mp;forum_id=90




AMG is offline   Reply With Quote
Sponsored Links
Old Oct 24, 2005, 3:02 PM   #2
Senior Member
 
terry@softreq.com's Avatar
 
Join Date: Jun 2004
Posts: 2,539
Default

It's difficult to figure out what your doing because I don't know your shutter speed, aperture, ISO, or whether your using automatic or manual settings on your flash.

You could possibly remedy this situation by using your flash in manual mode and use the lowest power of fill flash power (try 1/16 or 1/8th power or the equivalent of adding 1/2 stop or 1 stop of light to your frame).

You could also fool with exposure compensation a little. You could fool your camera into thinking there is less light available than actual, thus brightening up the scene.

Also try using longer exposure times, on a tripod.

So many variables, so many results...

- Terry


terry@softreq.com is offline   Reply With Quote
Old Oct 25, 2005, 4:58 PM   #3
AMG
Senior Member
 
Join Date: Mar 2004
Posts: 144
Default

I thought I would share, I had a lot of feedback over the various places I posted, and the answer seems to be Nevec, programming in many cameras that does the thinking for you and unfortunately undoing the somewhat manual control you have in creative modes. For example, in AV mode, the shuterspeed will change when you turn on the flash. That should not happen and therefore your background will become underexposed, but your subject will be exposed by the flash fill in. It does work nicely in those situations where your subjects are backlit, but when the scene is pretty well balanced, camera leads you away from the predicted result.



thanks to widowmaker who first mentioned this too me, and now I have read quite a bit about it.
AMG is offline   Reply With Quote
Old Oct 25, 2005, 7:47 PM   #4
Member
 
Join Date: May 2005
Posts: 84
Default

I now with most canon bodies, in certain modes (Tv and Av for example) the cameras exposure computer only takes the subject into mind w hen using flash. it will make the background pitch black if it has to. if you want the background exposed correctly, go into manual mode and use a slower shutter. or use slow syncrho if its night (with a tripod)
crash331 is offline   Reply With Quote
Old Nov 13, 2005, 4:31 PM   #5
Senior Member
 
Widowmaker's Avatar
 
Join Date: Jul 2003
Location: Bakersfield, CA
Posts: 851
Default

crash331 wrote:
Quote:
I now with most canon bodies, in certain modes (Tv and Av for example) the cameras exposure computer only takes the subject into mind w hen using flash. it will make the background pitch black if it has to. if you want the background exposed correctly, go into manual mode and use a slower shutter. or use slow syncrho if its night (with a tripod)
In AV mode, with a flash like the 420, 550 and up, canon cameras will expose the subject to match the background.
Widowmaker is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 2:01 AM.