GY-HM100 Gain setting at DVinfo.net

Go Back   DV Info Net > JVC ProHD & MPEG2 Camera Systems > JVC GY-HM 70/100/150 Series Camera Systems

JVC GY-HM 70/100/150 Series Camera Systems
GY-HM70, HM100, HM150 recording AVCHD MP4 & QuickTime .MOV to SDHC cards.


Reply
 
Thread Tools Search this Thread
Old May 20th, 2009, 06:33 PM   #1
Major Player
 
Join Date: Jan 2004
Location: Cornwall UK
Posts: 793
GY-HM100 Gain setting

I have just been testing the gain setting on my GY-HM100. In auto, the gain seems to max out at around 9db. Is there a setting that will allow me to conrol the maximum gain in auto mode. I have been used to this feature on previous cameras. I tested on a wall in my average lit living room. By switching between auto, and manual with gain set at 12db. The manual setting was far better. I was monitoring through a 42" screen via HDMI. Just wondered if this auto gain can be pumped up a bit??
__________________
Colin
Colin Rowe is offline   Reply With Quote
Old May 20th, 2009, 08:01 PM   #2
Wrangler
 
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
You should be able to adjust the Auto Exposure (AEħ button on back) while the gain is in AGC to increase the gain. That will determine how bright or dark you want the AE to be.
__________________
Tim Dashwood
Tim Dashwood is offline   Reply With Quote
Old May 20th, 2009, 11:32 PM   #3
Regular Crew
 
Join Date: Apr 2009
Location: OK
Posts: 62
I just tried this pointed at a book case and auto gain seemed to go all the way up to 15/18dB
Elvis Ripley is offline   Reply With Quote
Old May 21st, 2009, 06:13 AM   #4
Major Player
 
Join Date: Jan 2004
Location: Cornwall UK
Posts: 793
Quote:
Originally Posted by Elvis Ripley View Post
I just tried this pointed at a book case and auto gain seemed to go all the way up to 15/18dB
This is what I would have expected, I will do some more tests this evening. It seems strange, but as mentioned the image most definately brighened up when I engaged manual mode @ 12db. Perhaps other owners could comment??
__________________
Colin
Colin Rowe is offline   Reply With Quote
Old May 21st, 2009, 11:25 AM   #5
Wrangler
 
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
Colin. Let me see if I can explain this better.

When using automatic gain control (or any combination Auto Exposure features) the camera will do its best to find the "proper" exposure. In your case pointing at a wall the camera settled on an exposure that it thought was appropriate, but you think it should be brighter. When Elvis pointed at a bookcase (which I assume is much darker than a wall) the camera required more exposure and then increased the gain accordingly.

You can tell the camera what you would like it to consider the "proper" exposure when using Auto Exposure features. You can do this by pressing the AEħ button on the back and then adjusting the exposure the way you like with the adjustment dial. Once you are happy you can lock it in by pressing in and holding the adjustment dial for more than 1 second.
__________________
Tim Dashwood
Tim Dashwood is offline   Reply With Quote
Old May 21st, 2009, 11:28 AM   #6
Regular Crew
 
Join Date: Apr 2009
Location: OK
Posts: 62
I would say that is right. I purposely didn't give it enough light and used a complex shot so that it would need to turn the gain all the way up.
Elvis Ripley 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 > JVC ProHD & MPEG2 Camera Systems > JVC GY-HM 70/100/150 Series Camera Systems

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 12:26 AM.


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