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#1 L K Keerthi Basu

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Posted 14 June 2005 - 12:12 PM

What is the running sound level of a movie camera in decibels? From what distance is this measured? What is the recommended level for the spot recording(sound)?
I think this should be known to a cinematographer because one of the sound recordist has asked me about this.

L.K.Keerthibasu
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#2 John Pytlak RIP

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Posted 14 June 2005 - 12:54 PM

What is the running sound level of a movie camera in decibels?  From what distance is this measured? What is the recommended level for the spot recording(sound)? 
  I think this should be known to a cinematographer because one of the sound recordist has asked me about this.

  L.K.Keerthibasu

<{POST_SNAPBACK}>


Camera manufacturers usually publish noise data for their cameras. I believe they are measured in normal operational configuration (with lens, with film) in an anechoic chamber with the microphone 1 meter in front of the camera. Not sure of the "weighting factor".

For example, here is the data for the Aaton XTR:

http://www.aaton.com...tr/xtrspecs.php

Noise level 20 dB -1/+2.


And the Aaton 35-III:

http://www.aaton.com.../35/35specs.php

Noise Level 4-Perf: 30 / 33 dB. 3-Perf: 24 / 26 dB


Just for reference, here are typical noise levels:

http://www.chs.ca/in...ise/levels.html
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#3 Max Jacoby

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Posted 14 June 2005 - 01:45 PM

Pretty much any recent 35mm sync sound camera will run at 20dB. This includes the Arricam Studio, 535, Panavision Millenium, Platinum among others.
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#4 Phil Rhodes

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Posted 14 June 2005 - 03:13 PM

Hi,

However, any camera you're likely to actually end up using...

Phil
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#5 Rolfe Klement

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Posted 14 June 2005 - 04:13 PM

Not sure if you have any setups planned with higher frame rates - but the higher the FPS : the higher the noise - so most published ratings are for 24|25 fps

thanks

Rolfe
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#6 Matt Pacini

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Posted 15 June 2005 - 03:21 PM

All cameras are different, and they're different depending on if they've been lubricated recently, etc.
I just lubed my Canon Scoopic M, and it got about 1/2 as loud!
I think you're only going to find specs for recent high-end film cameras.

The confusing thing is, the listings of decibel levels are not that helpful, because different things will sound louder or more quiet, depending on the frequencies present.
The human ear is more sensitive to certain frequencies, and unfortunately, camera noise tends to fall into those bands!
For instance, an eggbeater might have a similar decibel level to someone rubbing their shoes across a carpet, but guess which one you will think is more intrusive in your dialog tracks?

The other problem is that the frequencies from camera noise that you need to notch out in post (if you can't eliminate them on-set) significantly affect the fidelity of dialog tracks, because much of the human speech is in those same frequencies, so it gets the same treatment, thereby sounding really unnatural.

Matt Pacini
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