Old 11-29-2006, 03:09 AM   #1
WSOR 3807
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Question Light spots in photos

Now I know I've heard this discussed before, but admitedly I've never paid attention because it's never applied to me until now. And in searching old forum threads I can't seem to find the ones I've seen this explained in. But, if you folks would bear with me and be willing to explain it again, I'd appreciate it.

Anyway, I recently got myself a camera upgrade, getting my first DSLR with a Canon XTi. To go with it I got an extra lens with a 200mm max. I finally had a chance to try out the camera for a "coming at you" shot, and I noticed a problem. There are little light spots that show up in the photo. If you look at the attachment photo it is clearly noticable on the cigar band of the BNSF engine. I do have a UV filter on the front to make sure that I don't scratch the actual lens, and if I remember right this has something to do with it. But what is the solution to stoping the spots? I'd like to leave the filter on the make sure that the lens doesn't get scratched if I can, but I could take it off for just these kinds of shots if that's what's necessary.

Thanks,
Noah Hofrichter
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Old 11-29-2006, 04:04 AM   #2
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I think (if your camera has it) ...it is the camera's auto-focus beam. I've had that before... I either shut it off or I find that if I take the picture before it's done focusing, it shows up. I might be wrong though..

Cam
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Old 11-29-2006, 04:34 AM   #3
Stephen T.
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either im blind or just dont see them. But it could just be lens flare.
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Old 11-29-2006, 02:56 PM   #4
Bill
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Yes, it's your UV filter, it's bending the light just slightly.
Whenever you're taking a shot of a pointed light source (headlamp, streetlight, etc) take the UV filter off. Otherwise you'll continue to get the 'green globs'.

Good luck,
Bill
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Old 11-29-2006, 03:47 PM   #5
Pat Lorenz
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Bill is right, the filter is reflecting the headlights back on the lens, when taking pictures near dusk, sunset, or at night you will have this effect happen. This shot is in very dark shadows so that makes the reflection happen. Next time you need to take off the filter, its as simple as that.
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Old 11-29-2006, 03:48 PM   #6
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Default Flare

Looks like flare to me.

Could be either your filter or lens.

Try taking a similar shot without the filter, if it disappears the problem solved.

If not try taking that type of shot at a different angle to minimise the reflection, clone it out or just live with it

Alan
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Old 11-29-2006, 10:30 PM   #7
WSOR 3807
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Thanks guys, I appreciate the replies. I'll keep this in mind the next time I'm taking these kinds of shots, and I'll take the UV filter off. Let's hope that solves it.

Thanks again,
Noah
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Old 12-04-2006, 04:59 AM   #8
Rod Williams
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Default Get it off

Absolutely, the filter must come off for approaching headlights. You can fix the problem in photoshop by cloning the offending light patches out of the shot. It takes some time but it's worthwhile for a good keeper.
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