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420EX flash

FORUMS General Gear Talk Flash and Studio Lighting
Thread started 23 Mar 2004 (Tuesday) 21:14   
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Brianbar
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Canada
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Does anybody have any suggestions.
I have a Canon 420EX flash, when I use it on either my 10D or Elan 11, the exposures are inconsistent, some underexposed and some over.
I am mounting the flash directly onto the hot shoe.

Brian
Winnipeg

Post #1, Mar 23, 2004 21:14:08




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Scottes
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What settings are you using on the camera, Av, Tv, P? What are the conditions, ie; inside, outside backlit, etc?

Do you consistently get overexposure when backlit, or underexposure when inside?

Any more info will help.

Post #2, Mar 23, 2004 21:31:32


You can take my 100-400 L away when you pry it from my cold, dead fingers.
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SWPhotoImaging
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It's obviously defective. I'll give you $50 for it :)

Post #3, Mar 23, 2004 21:37:49


SWPhoto-Imaging

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Brianbar
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Scottes wrote:
What settings are you using on the camera, Av, Tv, P? What are the conditions, ie; inside, outside backlit, etc?

Do you consistently get overexposure when backlit, or underexposure when inside?

Any more info will help.

Thanks for your response, all photos are taken inside using either Auto or (P)

Post #4, Mar 23, 2004 23:33:10




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kufel
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Do you use Flash Exposure Lock? Your problem is probably related to recomposing the picture after focus lock. Try FEL and post the results. Also - I always use M preset to 1/120 or 1/200 and f/5.6 - f/8 and bounce off the ceiling (of course with FEL if I need to recompose after focus with compensation for pure black or white objects), the flash metering does excellent job.

Post #5, Mar 24, 2004 00:18:05


EOS 7D, EF 24-70mmL 2.8, EF300mm f4 IS, EF70-200 f2.8 IS, EF 50mm f 1.8, EF17-40 L f4, EF 2x Extender MkII, 550EX, 420EX, EOS 3 (yes-film...)

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scottbergerphoto
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Brooklyn, NY, USA
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Brianbar wrote:
Does anybody have any suggestions.
I have a Canon 420EX flash, when I use it on either my 10D or Elan 11, the exposures are inconsistent, some underexposed and some over.
I am mounting the flash directly onto the hot shoe.

Brian
Winnipeg

I use the 420EX with my G2, 10D, and 550EX. I've never had that problem.
I suggest a simple test:
1.Set your 10D on a tripod on P or Auto, 420EX in the hot shoe.
2. Take a 5-10 of pictures of THE SAME subject / ambient lighting, starting with no FEC. Check to see if they are consistent (well exposed, underexposed, overexposed).
3. Then dial in different amounts of FEC until you get a good exposure. Then take another 5-10 shots at that setting.
4. If pictures taken at the same setting and the same subject/ambient lighting are inconsistent then there is a problem with the flash or the camera's ETTL.
5. If the pictures at a given setting are the same and you are able to properly expose the subject at a particular setting consistently, then it may be that you need to get more familiar with the ETTL. It is also possible that either the camera or flash is calibrated incorrectly, requiring you to add/decrease output with FEC when you should'nt have to.
Regards,
Scott

Post #6, Mar 24, 2004 07:23:35


One World, One Voice Against Terror,
Best Regards,
Scott
ScottBergerPhotography

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Scottes
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Are you possibly focusing on a subject, then recomposing? This will throw off the flash also.

A couple of short articles to read which may help:
http://photonotes.org ...s/beginner-faq/flash.htmlexternal link
http://bobatkins.com ...q/eosfaq24/3flash.h​tml#q0external link

Post #7, Mar 24, 2004 07:38:29


You can take my 100-400 L away when you pry it from my cold, dead fingers.
Scottes' Rum Pages - Rum Reviews And Infoexternal link
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Brianbar
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Senior Member
Joined Feb 2004
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Canada
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Thank you all for your suggestions, they helped.
I tried another 420EX flash and had the same problem, so it must be me.
I will now try your suggestions, thank again
Brian

Post #8, Mar 25, 2004 19:28:34




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420EX flash
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