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 Problem when shooting time-lapse, can anyone help please? 
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Joined: Mon Sep 16, 2013 12:28 pm
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Post Problem when shooting time-lapse, can anyone help please?
Hoping somebody will be able to shed some light on a problem I experienced shooting a night time lapse. Check out the below video that shows green and blue smudgy flare type things above the building (top centre of frame, over the highest part of the building). I can't work out what they are and how they were caused. I shot a moving time-lapse on 5dMKIII with 17-40L. The exposure settings were 5 seconds @ f6.3 ISO2500. I took 217 exposures over about 20 minutes. When I went to compile them I noticed this weird effect showing up. I thought it might be lens flare caused by bright lights and long exposure but the blue and green bits don't move screen position and the camera was on a motorised slider. The lens was definitely clean, so the only other thing I could think of is a problem with the sensor. But I have jut shot a few more stills in the dark at the same settings and I'm not getting anything like the blue green streaks. If anybody could help with this it would be greatly appreciated. Thanks very much.



Mon Sep 16, 2013 12:37 pm
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Joined: Tue Apr 29, 2008 2:48 pm
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Post Re: Problem when shooting time-lapse, can anyone help please
I'm going to guess that you have a filter (even a clear UV filter) on the front of your lens and those are reflections on the filter - take it off and it goes away - we've all done it at one time.

Timt

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Mon Sep 16, 2013 2:07 pm
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Post Re: Problem when shooting time-lapse, can anyone help please
Thanks for replying Timt, unfortunately there was no filter, its an almost brand new 17-40L which was spotless, no dust marks or anything.


Mon Sep 16, 2013 10:41 pm
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Post Re: Problem when shooting time-lapse, can anyone help please
Ok second guess is light coming thru the viewfinder, or some othe source of reflected light.

Timt

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Tue Sep 17, 2013 6:09 am
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Post Re: Problem when shooting time-lapse, can anyone help please
That really really looks like flare to me.
Your move looked pretty short so it's definitely possible that it was flare, especially since you didn't turn your camera at all and it just moved slightly closer to a bright light source far away...


Tue Sep 17, 2013 7:47 am
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Post Re: Problem when shooting time-lapse, can anyone help please
Thanks for the suggestions. The view finder was blocked throughout shooting so definitely wasn't coming in there. I guess it could be flare entering the lens from the front, but I can't work out what would cause it, it would have to be reflected off the building, and as the building moves in the shot, I would have expected the flare to have as well?


Tue Sep 17, 2013 8:31 am
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Post Re: Problem when shooting time-lapse, can anyone help please
my third guess was lens flare - you can bring a flag to block the light from the lens. When I used to work on commercial productions the 1st Camera Assistant's job was to look at the front of the lens to make sure there wasn't any light that was hitting the lens and causing lens flares - so just have your camera assistant take care of that ;-)

tt

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Tue Sep 17, 2013 11:01 am
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Post Re: Problem when shooting time-lapse, can anyone help please
what ever it is it looks like a refection of some sort

tt

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Tue Sep 17, 2013 11:02 am
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Post Re: Problem when shooting time-lapse, can anyone help please
UFO? Rip in space time? :roll:


Tue Sep 17, 2013 1:59 pm
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Post Re: Problem when shooting time-lapse, can anyone help please
That's just some lens flare, your shooting directly into some very bright lights (center) at night. The lights can reflect off your sensor plate and bounce around off the back element etc..


Tue Sep 17, 2013 3:02 pm
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