UV filter causes halos and disco effects at DVinfo.net

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Old July 10th, 2004, 07:22 PM   #1
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UV filter causes halos and disco effects

Has anyone else had any weird results from their
Canon UV filter. It seems like everytime I use it in poorly lit situations I get some weird halos or stobe effects around headlights and other flashing lights. I was thinking that I might have my f-stop set to low. It has happened a few times when I had the camera set up to f1.6-2, 1/30th-160th on the shutter, no gain, autofocus off, preset outdoor white balance. I have cleaned the lens and filter but they really werent that dirty. I have some frame grabs but I dont have a site to post at.
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Old July 10th, 2004, 10:39 PM   #2
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This is common, particularly for dark scenes with bright points. Sometimes called "fireflies", it's caused by reflections bounced between the lens and the filter. Solution: take the filter off the lens.
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Old July 10th, 2004, 11:41 PM   #3
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Ryan,

Good quality COATED filters are less likely to cause this effect. May want to try a different filter.
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Old July 11th, 2004, 03:26 PM   #4
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I had the same problems with a cheap UV filter. Now I am using a Hoya filter - works perfect, without halos and other unwanted effects.
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Old July 11th, 2004, 07:54 PM   #5
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Thanks a bunch for the input. I thought maybe since it was a Canon Filter it would be adequete, I recall it wasnt much money. I will try out another brand sometime soon.
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