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 Author
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Topic: Green Goblin effect (Read 14245 times)
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Barrierislandgirl
Newbie
Posts: 5
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I have a relatively new Canon EOS 40D which I love. It has been about 3 1/2 months since I purchased it on Amazon.com. I've noticed when I am using flash (built-in or my 430EX Speedlite) that occasionally people will have bizarre patches of green on their face! It has happened with various lenses, so it has to be within my camera. Is it something I'm doing or could it be a faulty sensor?
Thanks so much.
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Bob Atkins
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I've never seen or heard of such an effect before. Do you have an example online anywhere?
I can't think of any camera defect which could cause something like this!
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KeithB
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The only thing I can think of is that the strobe is blowing out only the green channel. What does the histogram show?
Do you have Flash Exposure Compensation on? What is the White Balance set at? Is it set for flash?
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Barrierislandgirl
Newbie
Posts: 5
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I'm new to this site/forum, but I don't think we are allowed to post photo examples of problems and I would never post problem photos on my blog. I could e-mail an example to someone, however.
I generally have my camera on 'P', but it also happened when I first got the camera and had it on Auto. It happens with various lenses/flash. It's always on faces - generally near the eyes/cheek.
KeithB, sorry, I am not advanced enough for the FEC question. I'll look it up tonight and keep my fingers crossed that this could be the issue.
Thank you both for your responses.
DJ
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Bob Atkins
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You can attach a file here. Just click on "Additional Options" when you post a response. Maximum file size is 128KB. See the link to the attached "moon" file below.
It's possible you are blowing out the green channel, but I'm not sure what would cause that to happen.
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« Last Edit: February 07, 2009, 11:32:20 AM by Bob Atkins »
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Barrierislandgirl
Newbie
Posts: 5
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Hmmmm, I'm having a bit of a problem posting, but hopefully I have reduced the photos appropriately and will go through this time. For you guys, just keep in mind you're trying to help me discover the problem with my camera. I showed it to one photographer and he said there could be a duck sitting on this person's head reading a book and he wouldn't notice the green spot. :-)
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Bob Atkins
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Looks like a black eye!
I've never seen anything like that. Doesn't look like any kind of channel saturation. Looks more like something on the sensor, but if that were the case it would show up in the same place on every image, whether or not you used flash.
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Barrierislandgirl
Newbie
Posts: 5
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It is bizarre! It doesn't show up in every shot, but, for example, when I photograph people at Mardi Gras events at night or in low light and have to use my flash, this happens at least one or two times in the batch of photos. At an event last weekend, several photos like this occurred with someone wearing party glasses which may even have been lens-less. Obviously Ms. Sexy Santa wasn't wearing glasses, so it wasn't an issue in that photo.
Ah well. Thanks for taking a look. Maybe I have a haunted camera. ;-)
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KeithB
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Does it show up in RAW files, or just JPEGS?
If you shoot RAW+JPEG for a while, you can get a direct comparison!
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Barrierislandgirl
Newbie
Posts: 5
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Thanks for the suggestion, Bob. I don't shoot RAW, but after Mardi Gras season ends (I'm swamped with events 'til after Fat Tuesday) I may try that approach (RAW + Jpeg) and see what happens.
Til then - Laissez Les Bon Temps Roulez!
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