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Old Nov 28, 2010, 8:43 AM   #1
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Default Canon Speedlight 580 EX II problem

I recently purchased the speelight 580 EX II and from the beginning I have had underexposure problems with my EOS 40D. If I set the speedlight to overexpose by 1.5 stops the flash exposures are pretty good and the histograms are good. Without the overexposure setting on the flash pictures are always underexposed. Outside, without the flash the camera exposures are very good and pictures are excllent. If I use the 580 EX II with my canon G 10 The flash exposures are fine and the pictures are beautiful. I AM BAFFLED!!!! Any Suggestions or explanations.
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Old Nov 28, 2010, 8:54 AM   #2
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What mode (and settings in that mode) are you using?
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Old Nov 29, 2010, 11:32 AM   #3
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Default speedlight 580 problems

The mosde doesn't seem to make any difference. Typically I use P but get the same results in TV or AV also.
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Old Nov 29, 2010, 11:33 AM   #4
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acutally MODE, sorry
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Old Nov 29, 2010, 11:41 AM   #5
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How is the flash set up, its a fairly complicated piece of equipment. Do you have it tilted for bounce, is the catch light in or out? IS the diffuser in or out? What lens are you using? Some lenses dont report distance information. What metering mode are you in? What are the ambient lighting conditions?

Personally I seldom use auto anything, including TTL on the flash. I want to paint with the light, not let the camera hold the brush.
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Old Nov 29, 2010, 4:22 PM   #6
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The mode makes an enormous difference. Until you know what you are doing, do NOT use Av or Tv mode when using flash.

Try this:
Set to M, shutter speed at 1/125, aperture at f8, flash in ETTL mode.

You can post some images and we can try to help. Flash can be extremely complicated, and the settings and manuals are terrible. Try to get hold of a decent book or go on a course on the basics.
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Old Nov 30, 2010, 12:07 AM   #7
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I'll try the manual setting as you described and let you know what results I get. Thanks
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Old Nov 30, 2010, 12:07 AM   #8
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It is interesting , however that the same flash on the G 10 works perfectly!!
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Old Nov 30, 2010, 6:18 AM   #9
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Hi can I ask what batteries you are using, I ask because when I got my flash I got mixed results. It was only when I got 2500mah batteries that it worked properly.
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Old Nov 30, 2010, 2:55 PM   #10
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I set the camera on M, 1/125, f8 and ETTL Exactly the same results. 1.5 stops underexposed. If I set the flash to overexpose 1.5 stops the histogram (and the image) were well exposed and looked great??? Any ideas

I am using AA lithum batteries.

Remember the flash works great on the Canon G 10 with no extra flash exposure.
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