AGC Defeat question at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon EOS Crop Sensor for HD

Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.


Reply
 
Thread Tools Search this Thread
Old June 15th, 2010, 09:41 PM   #1
Major Player
 
Join Date: Aug 2003
Location: Dallas, TX
Posts: 431
AGC Defeat question

I've been filming several interviews in a studio with the mic plugged in directly into the T2i and have been very satisfied with the results. I recently took it on the street for some OTS interviews and the sound would randomly cut in and out. Is this the AGC function everyone is complaining about?
__________________
"Get Er Done!!!"
G. Lee Gordon is offline   Reply With Quote
Old June 16th, 2010, 08:09 AM   #2
Major Player
 
Join Date: Apr 2010
Location: Chelmsford England
Posts: 287
If you mean by that what is described as pumping, where AGC kicks in to raise the gain when nothing much is happening, resulting in background noise being heard at loud volumes, then yes.

But the way you phrase it, cutting in and out, it doesn't sound like AGC. Can you be more specific?
James Donnelly is offline   Reply With Quote
Old June 18th, 2010, 05:02 PM   #3
Major Player
 
Join Date: Aug 2003
Location: Dallas, TX
Posts: 431
Out on the streets, when the wind started to blow the sound would cut off. I've never experienced that before. That is why I was wondering if that was due to the AGC function.
__________________
"Get Er Done!!!"
G. Lee Gordon is offline   Reply With Quote
Old June 18th, 2010, 10:10 PM   #4
Trustee
 
Join Date: Nov 2006
Location: San Angelo Texas
Posts: 1,510
Yes. The wind "scraping" across the mic holes can be a loud enough noise and the AGC cuts the recording gain suddenly. Two ways to try to get around this are the use of an external mic with furry windmuff (will help but may not completely eliminate "pumping") or the use of an external audio recorder like the ZoomH2 or ZoomH4n (both also with furry windmuff - available from thewindcutter.com).

I actually often use both at once, the Rode SVM with "Deadcat" windmuff on the camera plugged into the mic input and my ZoomH2 with windmuff on a stand out in front of the cam and as close to the talent as I can get it without it showing in the picture.

The camera audio is mainly for synchronization when I position the WAV audio from the ZoomH2 on a separate audio track in the editing package. I synch on the command "Action" for each scene by aligning the waveforms. When it's right and sync looks good I mute the camera audio and trim each scene where I need for "in" and "out" points.

The camera audio can also be a "backup" in case the Zoom audio went south.

For good audio you almost have to use an external audio recorder with these DSLRs.
Bruce Foreman is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon EOS Crop Sensor for HD

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 12:46 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network