The purpose behind setting the gain to -3db at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).


Reply
 
Thread Tools Search this Thread
Old August 8th, 2007, 11:11 AM   #1
Major Player
 
Join Date: Jul 2007
Location: Gainesville, VA, USA
Posts: 327
The purpose behind setting the gain to -3db

I remember seeing an excellent video posted here by someone who had recently bought the XH A1. An early morning shot in park (on his way to work). Simply incredible and inspiring!

In his post he says he always sets the gain to -3db. I'm curious as to what that gets him.

Less noise?
Shiv Kumar is offline   Reply With Quote
Old August 8th, 2007, 12:33 PM   #2
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,294
Potentially somewhat less noise (of CCD thermal and dark current origins) in the image, and perhaps slightly bit less effective usable dynamic. The lower noise may be most apparent in images with large areas of shadow or low contrast, and the dynamic range may be most apparent in images with high intensity spots. Other exposure setting (e.g., using a slow shutter) may have the effect of offsetting the some of benefit of a -3 dB setting.

Whether or not -3 dB is appropriate for a give shoot is largely a matter of image content and personal preference.
__________________
dpalomaki@dspalomaki.com
Don Palomaki is offline   Reply With Quote
Old August 8th, 2007, 06:07 PM   #3
Trustee
 
Join Date: Dec 2004
Location: Lipa City Batangas, Philippines
Posts: 1,110
Setting -3dB also helps if you are trying for a narrow depth of field because it means you have to open the lens a bit more to compensate.

Richard
Richard Hunter is offline   Reply With Quote
Old August 9th, 2007, 02:53 AM   #4
Major Player
 
Join Date: Jul 2007
Location: Gainesville, VA, USA
Posts: 327
Don, Richard,

Thank you both for your replies. Very informative. Didn't think about the -3db trick to get more depth of field.
Shiv Kumar is offline   Reply With Quote
Old August 9th, 2007, 09:49 AM   #5
Trustee
 
Join Date: Dec 2004
Location: Lipa City Batangas, Philippines
Posts: 1,110
Neither did I. I picked it up from a Chris Hurd post on the forum. :)

Richard
Richard Hunter is offline   Reply With Quote
Old August 9th, 2007, 03:34 PM   #6
Regular Crew
 
Join Date: Oct 2006
Location: Alabama
Posts: 31
Less depth of field actually
Joe Bryan is offline   Reply With Quote
Old August 10th, 2007, 08:37 AM   #7
Major Player
 
Join Date: Jul 2007
Location: Gainesville, VA, USA
Posts: 327
Yes, Correct :)
Shiv Kumar 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 HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 02:20 AM.


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