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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 19 Apr 2006 (Wednesday) 04:19
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580ex challenges

 
LarrySilva
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Apr 19, 2006 04:19 |  #1

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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jngo
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Apr 19, 2006 05:11 |  #2

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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dengli
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Apr 19, 2006 05:39 |  #3

Keep a lookout for bright or reflective objects in the frame. They really throw off ETTL as exposure takes these into account.


Dave

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chris ­ clements
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Apr 19, 2006 07:00 |  #4

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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MDJAK
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Apr 19, 2006 07:23 as a reply to  @ chris clements's post |  #5

chris clements wrote:
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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Curtis ­ N
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Apr 19, 2006 08:46 as a reply to  @ MDJAK's post |  #6

MDJAK wrote:
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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René ­ Damkot
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Apr 19, 2006 09:39 |  #7

You can do the same in Av with EC :rolleyes:
Only difference is: In M the flash is considered main light IIRC, and NEVEC doesn't come in to play.


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Curtis ­ N
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Apr 19, 2006 09:54 as a reply to  @ René Damkot's post |  #8

René Damkot wrote:
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.:rolleyes:


"If you're not having fun, your pictures will reflect that." - Joe McNally
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René ­ Damkot
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Apr 19, 2006 11:15 |  #9

Aahh, but you were talking about 'controlling the amount of ambient light', not totally ignoring it ;)


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togger
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Apr 20, 2006 01:00 |  #10

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.c​om/canon/ (external link)

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.


5D & Grip, 30D; 24-105L, 50 F1.4, 10-22, 17-85, 28-135, 580EX.
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togger
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Apr 20, 2006 01:09 |  #11

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.


5D & Grip, 30D; 24-105L, 50 F1.4, 10-22, 17-85, 28-135, 580EX.
Bowens Monolites.
Film Junk; Pentax 67; 45, 105, 165. Canon 300, A1 & Lenses

  
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580ex challenges
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