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What causes a halo effect?

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Thread started 16 Jan 2006 (Monday) 11:11   
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DAG123
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What would cause a 'halo' around the outside of a photo?

Post #1, Jan 16, 2006 11:11:38




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liza
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Post an example with exif data so we can take a look. My guess would be vignetting.

Post #2, Jan 16, 2006 11:35:51



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DavidW
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Vignetting sounds right, but that's not normally described as a halo. A vignetted image has dark corners.

The term halo is normally applied to unwanted "futz" at high contrast edges, which is normally chromatic aberration (or oversharpening).

David

Post #3, Jan 16, 2006 11:39:42




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DAG123
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Yes, my mistake, I should have said vignetting.

Sorry can't post photo from my location. I just had some problems with this on the weekend and was curious what was the cause. I suppose you would need to see the photo. If you have a general idea it would be appreciated, I won't be home until Friday :(

Post #4, Jan 16, 2006 11:56:21




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DavidW
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If we know it's vignetting, tell us more about the lens, any filters, hoods or flash that was in use, and details from the EXIF (focal length and aperture especially) - also if you have any idea of the distance between the camera and the subject.

David

Post #5, Jan 16, 2006 12:45:46




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picard
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DAG123 wrote:
What would cause a 'halo' around the outside of a photo?

It is due to weeds. You see halo effect after smoking a pack of weeds. :D

Post #6, Jan 16, 2006 16:14:38


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DAG123
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It is a Digital Canon EOS Rebel 350XT with stock lens. I have only been using it on auto. I just go it for Christmas and am trying to learn.

Is it normal for the LCD to be blank when shooting RAW?

Post #7, Jan 16, 2006 16:17:58




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