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Old 19th of April 2006 (Wed)   #1
LarrySilva
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Default 580ex challenges

Im have the 580 ex with my 20d and for the life of me I cant get good exposures. I have it on ttl, manual etc... Ive tried everything and it just wont give me consistent exposure. PLEASE HELP!!!! What am I doing wrong.
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Old 19th of April 2006 (Wed)   #2
jngo
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Default Re: 580ex challenges

wow. that's a tuff question with numerous answers. it all depends on the situation. could you give some examples? pics, if you have them would be even better. i've had my 580 for about half a year now and still struggle with it at times. practice, practice and more practice.
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Old 19th of April 2006 (Wed)   #3
dengli
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Default Re: 580ex challenges

Keep a lookout for bright or reflective objects in the frame. They really throw off ETTL as exposure takes these into account.
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Old 19th of April 2006 (Wed)   #4
chris clements
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Default Re: 580ex challenges

Can't help unless you're more specific; post examples.
You've had the flash on various settings - but what about the camera?
You'll generally get better (and certainly more consistent) results with the camera on 'm' and just the flash on auto.
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Old 19th of April 2006 (Wed)   #5
MDJAK
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Default Re: 580ex challenges

Quote:
Originally Posted by chris clements
Can't help unless you're more specific; post examples.
You've had the flash on various settings - but what about the camera?
You'll generally get better (and certainly more consistent) results with the camera on 'm' and just the flash on auto.
I don't disagree with that, but I have to wonder why. Why does the camera give better results on "m" when using the flash?
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Old 19th of April 2006 (Wed)   #6
Curtis N
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Default Re: 580ex challenges

Quote:
Originally Posted by MDJAK
Why does the camera give better results on "m" when using the flash?
Because you can control the DOF with the aperture, and control the amount of ambient light with the shutter speed.
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Old 19th of April 2006 (Wed)   #7
René Damkot
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Default Re: 580ex challenges

You can do the same in Av with EC
Only difference is: In M the flash is considered main light IIRC, and NEVEC doesn't come in to play.
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Old 19th of April 2006 (Wed)   #8
Curtis N
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Default Re: 580ex challenges

Quote:
Originally Posted by René Damkot
You can do the same in Av with EC.
It would take a heluva lot of EC to get your shutter speed to 1/250 at f/11 indoors.
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Old 19th of April 2006 (Wed)   #9
René Damkot
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Default Re: 580ex challenges

Aahh, but you were talking about 'controlling the amount of ambient light', not totally ignoring it
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Old 20th of April 2006 (Thu)   #10
togger
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Default Re: 580ex challenges

I have tried my 580 EX both with a D20 and D30. I find ETTL unusable when the 580 is the main light source.

It apparently is a distance based fill in depending upon available light.

If it consistently underexposed it wouldn't be as bad, but it also varies with your ISO setting (which I guess is part of the available light calculation)

Canon try and explain their logic at:

http://photoworkshop.com/canon/

Worse of all if you set your flash to Manual and turn the dial past the green rectangle it sets the flash to ETTL automatically and doesn't put if back again when you return to your original setting.
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Old 20th of April 2006 (Thu)   #11
togger
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Default Re: 580ex challenges

To use Manual flash press the button in the middle of the dial on the flashgun and adjust the power using the dial. Or adjust the aperture on the camera.

Best to have the camera set to manual as well, but don't go over the sync speed.
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