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Thread started 18 Jun 2010 (Friday) 09:28
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50D question about FEC and EC

 
jeljohns
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Jun 18, 2010 09:28 |  #1

I'm reading a book right now that talks about adjusting the Flash Exposure Compensation and Exposure Compensation separately when taking photo outside. FEC to expose the subject and EC to adjust the background. My camera seems to have linked the two. When the flash is turned on, any adjustments made to EC are actually adjusting the flash. Is there a way to make these two separate actions?

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gonzogolf
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Jun 18, 2010 09:32 |  #2

What mode are you in? I dont think in reality your camera is doing that as they are indeed separate actions.




  
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AbPho
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Jun 18, 2010 09:33 |  #3

I think you should mention what camera body you have. What mode are you in (P, Av, Tv, M)? You use the meter in the view finder (LCD screen) to expose to the background. Then the FEC to expose the foreground.

For instance on a 50D body there is a button by the top LCD panel to set the FEC. You dial in the flash intensity in stops. I use manual exposure 99% of the time. I would set the ISO, aperture, and shutter speed to expose for the background.

Hope that helps.


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jeljohns
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Jun 18, 2010 10:06 as a reply to  @ AbPho's post |  #4

I'm using a 50D, in M and AV modes. When I changed the FEC on the flash, it also changes on the camera. When I press the ISO/EC button it reflects the change made to the flash. I can't figure out how to separate the two controls. If I try to changed the EC on the camera it changes and reflects that change on the flash output as well.




  
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gonzogolf
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Jun 18, 2010 10:09 |  #5

There is no (EC) compensation in M mode.




  
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AbPho
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Jun 18, 2010 10:10 |  #6

In M it's manual. :D But you are correct.


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AbPho
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Jun 18, 2010 10:14 |  #7

The button should be ISO/FEC on a 50D. You can change the FEC on the flash or the body. They are the same thing. In AV mode you can use the rear dial to change the EC. In M you have to manually set your exposure. No EC like gonzogolf said.


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jeljohns
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Jun 18, 2010 10:19 as a reply to  @ AbPho's post |  #8

In Av mode-I zeroed out the flash on the actual flash itself. I press the ISO/EC button and adjust the EC +2. When I go into the menu on the camera is shows 0 on the EC scale and +2 on the FEC scale. The actual flash itself still reads 0.

I can't figure out how to change EC in the camera, but not change FEC.




  
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AbPho
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Jun 18, 2010 10:21 |  #9

The right most button on the top of the 50D is for setting the ISO and FEC. I will pull out my flash and try something.


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gonzogolf
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Jun 18, 2010 10:23 |  #10

I think you are just changing the FEC in two places, but not the EC at all.




  
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gonzogolf
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Jun 18, 2010 10:25 |  #11

Try adjusting your EC by half pressing the shutter and rolling the wheel.




  
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jeljohns
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Jun 18, 2010 10:25 as a reply to  @ AbPho's post |  #12

Right, then how do I change just EC? When flash is NOT on the ISO/FEC is what I press first and then I can adjust the EC with the rear wheel. When flash is ON that button adjusts the FEC (but this does not reflect on the flash itself). So when flash is ON what do I do to adjust EC? Is there another button? Just turning the wheel changes my fstop.




  
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stsva
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Jun 18, 2010 10:28 |  #13

Is your power switch in the bent line position? See p. 101 in your 50D manual.


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AbPho
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Jun 18, 2010 10:33 |  #14

Okay. Here we go.

Here we see that the button changes the ISO and FEC. Notice how FEC is at 0.

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FEC of 0 is shown here on the rear display.
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With no FEC the flash head displays like this:
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HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO


With FEC adjusted to +2 in the camera, the top LCD displays as follows:
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HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO


The rear LCD:
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HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO


And the flash LCD:
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HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO



Does that help or am I missing something?

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AbPho
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Jun 18, 2010 10:34 |  #15

Okay. I saw your other post. I use the rear dial to change EC when in Av or Tv. No button pressing.


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50D question about FEC and EC
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