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Exposure Issue
Feb 6, 2012 16:15:48   #
clixpix Loc: Surprise, Arizona
 
I took the two photos at our local riparian area. They were taken about 2-3 seconds apart according to the metadata. Everything thing was the same between the two shots, but the exposures are vastly different. Any suggestions will be welcome. The camera is a Canon 50D using a 70-200 f/2.8 with a 2X extender at 1/500 sec. and ISO 400.





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Feb 6, 2012 17:02:00   #
MT Shooter Loc: Montana
 
Your framing moves slightly to the right in the second pic. Were you spot metering?

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Feb 6, 2012 17:39:03   #
clixpix Loc: Surprise, Arizona
 
I was spot metering but I tried to get the spot on the head of the egret. I agree a slight movement would pick up the dark leaves and change the exposure. Good observation and thanks for the suggestion.

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Feb 6, 2012 17:55:45   #
MT Shooter Loc: Montana
 
It doesn't take that much. Moving from cheek to beak will make a big difference, as will the brown to white areas. Looks to me like that was most likely your issue on this one.

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Feb 6, 2012 18:56:37   #
English_Wolf Loc: Near Pensacola, FL
 
The only reason is the 'spot metering' was not at the same location.

If you also shoot in raw you will quickly realize that the two are nearly identical in dynamic range but not when looked at as a JPG.

This is not a big deal and not a 'misfire' from your camera.

If you want to lock onto one setting, just take the measure and enter the settings under the M (manual) setting of your camera.

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Feb 6, 2012 20:28:21   #
Meives Loc: FORT LAUDERDALE
 
clixpix wrote:
I took the two photos at our local riparian area. They were taken about 2-3 seconds apart according to the metadata. Everything thing was the same between the two shots, but the exposures are vastly different. Any suggestions will be welcome. The camera is a Canon 50D using a 70-200 f/2.8 with a 2X extender at 1/500 sec. and ISO 400.


If you would post them with a download ability I could pull up all of the specs and see what happened. Can you repost them this way. Thanks David in Florida

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Feb 7, 2012 09:57:43   #
RoysJungle Loc: Ohio
 
I concur with everyone about it spot metering moving but I would suggest shooting it in manual mode with spot metering off the back of the heron since it looks pretty darn close to the color of a grey card

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Feb 7, 2012 09:58:44   #
MtnMan Loc: ID
 
The View NX2 that came with my camera has a feature that lets you turn on a little box that shows you what was used for focus.

If you don't have something like that you could take a look at the Exif data...it should show a different distance to subject if the metering point changed.

I agree that slight movement of the camera thus changing the metering spot is the likely cause. It is a good example of how a little movement can mean a lot. In this case since both were far enough away and there was bright sun the f-stop was high so DOF large so focus OK on both. I suspect this kind of thing is a frequent cause of the focus problems people report here on UHH.




clixpix wrote:
I was spot metering but I tried to get the spot on the head of the egret. I agree a slight movement would pick up the dark leaves and change the exposure. Good observation and thanks for the suggestion.

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Feb 7, 2012 10:01:39   #
docrob Loc: Durango, Colorado
 
ahhh the proverbial where is my spot metering issue. Things can get tricky sometimes. Getting into a routine might help...a kind of mental check off - "oh yeah where exactly did I spot meter?

Welcome to the experienced oppps club.

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Feb 7, 2012 14:02:00   #
clixpix Loc: Surprise, Arizona
 
David:

You reminded me about seeing the focus spot on my pictures on the computer. I looked and did find that the focus spot moved off the heron and thus made a difference in exposure between successive photos. I will be sure to check this out in all future photos and also have the camera show on the LCD where the focus spot was when while I am taking the photos. This should lessen the exposure problem. Thanks for the suggestion.

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Feb 7, 2012 14:57:46   #
MtnMan Loc: ID
 
It was Larry and you are welcome.

clixpix wrote:
David:

You reminded me about seeing the focus spot on my pictures on the computer. I looked and did find that the focus spot moved off the heron and thus made a difference in exposure between successive photos. I will be sure to check this out in all future photos and also have the camera show on the LCD where the focus spot was when while I am taking the photos. This should lessen the exposure problem. Thanks for the suggestion.

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Feb 7, 2012 15:04:15   #
clixpix Loc: Surprise, Arizona
 
So sorry Larry,---Joe

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Feb 7, 2012 21:24:59   #
julesreyesmarko Loc: Los Angeles
 
might want to use AE Lock to maintain the same exposure throughout.

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Feb 10, 2012 20:11:35   #
Scubie Loc: Brunswick Georgia
 
Seems to me, an exposure in between both of these would do it for you.....Photoshop would fix it in a second...

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