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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 04 Nov 2009 (Wednesday) 07:46
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7D fill flash photo overexposed?

 
Loke88
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Nov 04, 2009 07:46 |  #1

I just upgraded from DigitalRebel XT to 7D. My old digitalRebel works flawlessly with the 420ex flash when I am shooting macro. I usually shoot in AV mode use the 420ex for fill flash. I seldom need to adjust FEC as the subject is always lighted up correctly.

However, the same cannot be said for the 7D when pairing up with the 420EX. The macro subject seems to always overexpose and I always need to manually reduce the flash out put to -2/3 or more. See picture below. I tried auto focus but the results are the same. Help is appreciated.

Setting:
Firmware: Firmware Version 1.0.9
Shutter speed: 1/100 sec
Aperture: 7.1
Exposure mode: Av
Flash: External E-TTL
Flash EF guide number: 2047.97
Metering mode: Evaluative
Drive mode: Single frame shooting
ISO: 1600
Lens: 90 mm
Focal length: 90.0 mm
AF mode: Manual Focus
White balance: Auto

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A sample output when a FEC -2/3 is used:
Setting:
Firmware: Firmware Version 1.0.9
Shutter speed: 1/80 sec
Aperture: 7.1
Exposure mode: Av
Flash: External E-TTL
Flash EF guide number: 2047.97
Flash exposure compensation: -2/3
Metering mode: Evaluative
Drive mode: Single frame shooting
ISO: 1250
Lens: 90 mm
Focal length: 90.0 mm
AF mode: Manual Focus
White balance: Auto
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egordon99
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Nov 04, 2009 09:36 |  #2

It's VERY possible that at f/7.1, ISO1600 at such a close range, the flash at it's minimum power setting is STILL too strong. Try a similar shot but put your flash into M and it's minium power (1/64 or 1/128 probably) and see what you get. You might need to use a lower ISO.

I bet that there is nothing wrong with your 7D and that this is operator error.

Setting:
Firmware: Firmware Version 1.0.9
Shutter speed: 1/100 sec
Aperture: 7.1
Exposure mode: Av
Flash: External E-TTL
Flash EF guide number: 2047.97
Metering mode: Evaluative
Drive mode: Single frame shooting
ISO: 1600
Lens: 90 mm
Focal length: 90.0 mm
AF mode: Manual Focus
White balance: Auto




  
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krb
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Nov 04, 2009 09:44 |  #3

You may want to experiment with a different metering method.


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TheBigDog
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Nov 04, 2009 12:54 |  #4

oddly enough I experienced the same happenings with my 420 when I purchased my T1i a couple of months ago. I have since gone to the 580EXII and haven't had any overblown issues since. I'm not saying it's something that could have been corrected with the 420, but I had the money and the 580 seemed like a wise investment for me.


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Nov 04, 2009 13:01 |  #5

I've never owned two cameras that metered exactly alike.. (be it flash or otherwise)
If we get too used to one, we then compare all others to it, and see the differences as a defect.

I'm pretty sure I posted a thread similar to this one back in 2003/04 when I first noticed that my new camera was metering significantly differently from my comfortable 10D.. after half a dozen bodies or more now I never expect anything to be the same.


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backslash
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Nov 05, 2009 08:16 |  #6

egordon99 wrote in post #8952882 (external link)
It's VERY possible that at f/7.1, ISO1600 at such a close range, the flash at it's minimum power setting is STILL too strong.

Well, but dialing in FEC -2/3 can provide less power???


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backslash
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Nov 05, 2009 08:16 |  #7

Would be interesting, if it's still a problem with firmware 1.1.0 .


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egordon99
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Nov 05, 2009 08:27 |  #8

backslash wrote in post #8958833 (external link)
Well, but dialing in FEC -2/3 can provide less power???

Not if you're already at the flash's minimum power :D

Note that the -2/3 FEC shot used ISO1250, and the 0 FEC used ISO1600.

It would be nice to hear back from the OP. I still think trying to shoot that close with a hotshoe flash at ISO1600 might be asking for trouble.




  
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yogestee
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Nov 05, 2009 09:26 |  #9

egordon99 wrote in post #8952882 (external link)
I bet that there is nothing wrong with your 7D and that this is operator error.

Could be.. Looking at your EXIF it appears you could be overexposing anyway..

When using flash of any kind always use manual exposure mode.. When using fill flash take a meter reading off the subject then adjust your FEC to around -1 1/2 to -2 stops under,,depending on subject to camera distance.. The available light is your main exposure,, the fill flash is there to give the subject some lift or reduce unwanted shadows,,fill flash should never dominate.. In fact it shouldn't even be noticable..

As Gordon said,,user error..


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griptape
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Nov 05, 2009 13:36 |  #10

I think your ISO is a little bit ridiculously high for this type of shot using flash. That's the glaring issue I see.




  
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apersson850
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Nov 05, 2009 16:11 as a reply to  @ griptape's post |  #11

ISO seems too high.
In E-TTL the flash can emit less power than what you can set it to manually.
As far as I can understand, we are here talking about the flash on the camera. Even as happy to overexpose as my 7D have been, it doesn't do that with the flash in the hotshoe.


Anders

  
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7D fill flash photo overexposed?
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