Has anyone else noticed this behavior? at DVinfo.net

Go Back   DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic LUMIX G / GF / GH / GX Series

Panasonic LUMIX G / GF / GH / GX Series
4K and AVCHD on a Micro Four Thirds system camera with interchangeable lenses.


Reply
 
Thread Tools Search this Thread
Old April 21st, 2010, 08:25 AM   #1
Regular Crew
 
Join Date: Jan 2009
Location: Round Rock, TX
Posts: 110
Has anyone else noticed this behavior?

Hi -

I have recently noticed something unusual with my GH1, and I'm curious if anyone else is seeing this...

First, my camera settings - I am in FHD movie mode, ISO = any (tested at ISO 100 and ISO 1600), Manual or Shutter priority mode (both exhibit this behavior), Nikon AI lens attached via Fotodiox adapter. Shutter speed is set to 1/50 (other shutter speeds do the same thing though), and the iexposure thing can be at any setting (I have it off right now). Gain - when in shutter priority mode - can be at any setting. Film mode is set to My film, which is contrast -2, saturation 0, color 0, and NR +2 (film mode doesn't seem to have any bearing though).

The behavior: If I point the camera at something dark - say, a poorly lit part of the room, then point the camera at a brighter portion of the room - say, a light, or a monitor - the camera seems to increase the gain. At first I thought nothing of this - I thought the camera was adjusting the LCD as it does in still photo mode. But then I realized that if I lock the exposure, the camera is more sensitive when I point back to a dimmer scene.

So last night, I did a quick test in my living room. I had the lights off, but had ambient light from an adjacent room (it was fairly dark). I set the ISO to 1600, set shutter priority mode, cranked the gain all the way up, then checked to see if I was still getting this behavior. Sure enough, if I pointed at the light in the next room, the camera would gain up. I locked the exposure while pointed at the light, then panned around the dark living room. The clip I got was by far the brightest image I have seen out of this camera.

The downside of course, is that it seems I don't really have as much control over the camera as I thought - it is bumping up gain when I am not expecting it ( and the wrong way it seems - why would gain increase when I point the camera at a light?). Of course, locking exposure seems to prevent it from changing, but still...
Jay Bratcher is offline   Reply With Quote
Old April 24th, 2010, 04:23 AM   #2
Major Player
 
Join Date: Nov 2007
Location: Finland
Posts: 317
Are you sure its the footage thats changing as well or just the preview? theres a mode that you can switch off that changes the LCD brightness.
Sami Sanpakkila is offline   Reply With Quote
Old April 24th, 2010, 08:48 AM   #3
Regular Crew
 
Join Date: Jan 2009
Location: Round Rock, TX
Posts: 110
Hi Sami -

Thanks for pointing out what should have been obvious to me :) I turned it off, and the behavior has gone away. I'm going to do another test though (tonight, since it's far too bright to test right now). I am still pretty sure I was getting more gain by doing this when I had the LCD setting on. I'll post back with some test results...

Thanks,
Jay
Jay Bratcher is offline   Reply With Quote
Old April 28th, 2010, 06:11 PM   #4
Regular Crew
 
Join Date: Jan 2009
Location: Round Rock, TX
Posts: 110
Testing was a bust. I could not affect gain by the method I described. I do still find it somewhat curious though - why would I be able to lock exposure on the LCD if it has no impact on the recorded image? Oh well, maybe I need more sleep or something. Nothing to see here folks - please keep moving :)
Jay Bratcher 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 > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic LUMIX G / GF / GH / GX Series

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 01:47 AM.


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