Question about Canon SPEEDLITE 580EX TTL Flash

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My snaps are underexposed with 350D camera and 580EX TTL

I am using 580EX TTL with my Canon 350D camera. My snaps are underexposed even when I shoot at a distance of 8 feet - 13 feet. The camera and flash setting in auto.

Please help.

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Re: My snaps are underexposed with 350D camera and 580EX...

I have had two flash heads replaced under warranty for this exact reason, 1 for master slave not functioning.

things do wear out, buy extended warranties.

use all manual settings including exposure, flash, take raw images with same camera of same subject in same lighting conditions (indoors) and switch flashes between pictures submitting resulting images and notes re images and settings to repair to prove it is flash and not settings.

I just got a flash back for this situation and it is firing 2.5 stops brighter than the identical unit i bought at the exact same time. I needless to say i will be shipping another flash in for repair today.

I have three flashes 1 on camera 1 for back up - which i alternate weekend to weekend and 1 in rmaintenance (repair) / shipping.

I shoot 2 weddings a weekend (yesterday on my feet for 14 hours camera in hand) and have an engineering background -

Remember good batteries - sells powerex 2700 - i have tested / experiemented with many and these are the only ones i have found so far that are consistent and are actuall 2600+...

Sometimes it is the flash...

Posted on Jun 02, 2008

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Re: My snaps are underexposed with 350D camera and 580EX...

Had the same problem with a 400d - only solution - buy a 30d

Posted on Jan 09, 2008

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Re: My snaps are underexposed with 350D camera and 580EX...

Set camera:

Single shot mode not servo/C modes
Focus sensor set for center
Make sure exp. comp is not set on -(minus) side.
Make sure your subject is locked on and not moving out of the autofocus (center) sensor.

Posted on Jan 03, 2008

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I have recently shot some pictures with my canon 580 EX flash. pictures seemed to be a bit underexposed. My camera is a 50D pictures shot at ISO 200. The lens was a canon 17-40 F4 L. Is is possible that...

It all depends on the environment you're shooting in. When shooting a wedding reception for instance inside in the evening I will generally use ISO 800 and I quite often use FE Lock which is very handy. FE Lock will pre-flash the speedlite and meter the result based on the center focus point in your viewfinder (it doesn't matter if you have set another focus point it will always meter to the center one so make sure that is over your subject when you use it). To use FE Lock press the button near your thumb that has the * symbol with the center focus point over the subject. You can then re-frame the shot if required and take the picture. The camera will take the picture based on that flash setting and you should find that the shot is better exposed.

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that the camera/flash set-up I use ... there are many variables - iso/metering setting/shutter settings/flash settings .
If it's a flash function problem, try this to isolate it - first, with the diffuser/reflectors tucked into the flash head, and the head straight up, with the flash set in master mode, turn it on and look on the back screen. push the mode button til you see the ETTL in the upper left of the screen .. then press the set button in the center of the dial and the nuber in the center of the display should flash (+0) while the light is flashing, rotate the dial to change the setting (i usually under power by 1/3 stop. Play with the exposures a few times to get the feel for what the EV shifts do to your exposure. generally speaking, for interior low-light, i prefer to bounce off the ceiling (if low ceilinged), if there's too much direct it will give you an uneven and predominantly underexposed image.
if you prees the mode button you will come to the same options for adjusting the output in manual mode, but it will not work with the autoexposure in the camera.
Try playing with the ETTL settings
I think the problem may be that you have somehow altered the power output setting on the 580.

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