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video noise in flourescent lighting-- newbie, help


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#1 Dan Jepson

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Posted 29 June 2006 - 08:19 AM

I was shooting in a classroom environment with flourescent lighting, and the window blinds open without direct sunlight. The speaker was wearing a dark shirt, with the wall behind him being much lighter. I turned on the ND 1 filter to eliminate some of the glare and turned the manual iris to 4.0; all other settings I left on auto, including the focus.

When I returned home, the video contained a lot of particle noise on the camera viewfinder as well as on the computer. I imported it both from the camcorder and my DSR-11 deck with little to no difference in the footage. Any help?
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#2 Michael Nash

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Posted 30 June 2006 - 11:32 AM

Was the GAIN left on auto? Gain is what usually creates video noise.
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#3 Michael Collier

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Posted 30 June 2006 - 03:47 PM

If you left everything on auto, you might have accidently put on the auto gain. In most rooms like what you described, you would have an appeture anywhere from 2.8-5.6 or so without ND (in general, there are a lot of variables to affect it) and when you put on the ND filter, you may have cut the light too much. What light loss does your ND filter provide? It could be that you cut the light too much and the auto gain decided to kick in. also remember that ND does not cut 'glare' in any significant way. It just brings down the level of the light without adjusting the DoF
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