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Old July 9th, 2006, 08:16 AM   #1
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Laser Beam ...

Hi all - I'm shooting a documentary shortly with a Canon XM2 (GL2) where the subject will be pointing a laser temperature gun towards to camera.

As in "Terminator" I was considering letting the laser track across the lens ... two questions:

1) Is this safe? (I won't be looking in viewfinder!).
2) Is there any danger to the camera itself?

Thanks in advance for any help!

Paul.
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Old July 9th, 2006, 11:23 AM   #2
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Paul, I did this once with a laser pointer on an XL1S. However, I did not point it directly at the lens. The effect of it hitting the *edge* of the lens cap momentarily, however, was quite enough. It flared nicely. I had smoke and dust in the air so the beam showed up nicely as well. I didn't need to blast the sensor with a light hotter than the Sun! Don't do it! Your manual probably even says don't. And don't point it at your eyes directly either.
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Old July 9th, 2006, 11:32 AM   #3
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Thanks Keith. Yes, I'm planning to have smoke in the air as well to highlight the beam.

I think I need to find someone with a steady hand with the laser ... !
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Old July 9th, 2006, 12:29 PM   #4
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can i ask why you do not just simulate this digitally? using lasers is never safe, and its better to be safe than sorry.
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Old July 9th, 2006, 01:39 PM   #5
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Hi Tim - yes I would consider it - any suggestions?

I'm using Sony Movie Studio as my editing package.

Paul.
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Old July 9th, 2006, 01:46 PM   #6
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i think something like aftereffects could be used here. if you want to do it so it appears directly its just a matter of having a red circle and messing with its blending mode till it gives you something you desire. lens flares can be added in alot of programs to.
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Old July 9th, 2006, 03:31 PM   #7
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Looking in the view finder wouldn't be an issue as the tv can't emit the same sort of light that the laser is... it's just duplicating what it can... and in this case rather poorly in comparison.
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Old July 11th, 2006, 02:22 PM   #8
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Quote:
Originally Posted by Kevin Richard
Looking in the view finder wouldn't be an issue as the tv can't emit the same sort of light that the laser is... it's just duplicating what it can... and in this case rather poorly in comparison.
yeh but the problem is damage to the sensor..
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Old July 11th, 2006, 02:45 PM   #9
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Originally Posted by Tim Johnson
yeh but the problem is damage to the sensor..
I understand this... I was just stating the facts as he was concerned about "I certainly won't be looking in the view finder".

I agree it's not a good plan to shoot it at the ccd's either, but looking at what would be recorded/burned in to the ccd on a monitor isn't harmful.
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Old July 11th, 2006, 03:57 PM   #10
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How about shooting a mirror image?

If it was just a laser pointer, I think it might be diffused by striking the mirror so would be safe filming it.
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Old July 11th, 2006, 04:14 PM   #11
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Originally Posted by Keith Loh
How about shooting a mirror image?

If it was just a laser pointer, I think it might be diffused by striking the mirror so would be safe filming it.
I'm pretty sure a mirror would be just as bright... you can't really diffuse a laser or you lose the effect of the "beam"
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Old July 11th, 2006, 04:22 PM   #12
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According to this site, http://www.naimark.net/projects/zap/howto.html, it shouldn't damage the sensor.

Still, you might consider a ND filter, a green filter would also be effective on a red laser.
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Old July 11th, 2006, 04:54 PM   #13
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Originally Posted by Adam Keen
According to this site, http://www.naimark.net/projects/zap/howto.html, it shouldn't damage the sensor.

Still, you might consider a ND filter, a green filter would also be effective on a red laser.
Thanks for posting that... it was a very interesting article!
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