Sony HVR-Z1U picture problem at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony HDV and DV Camera Systems > Sony HVR-Z1 / HDR-FX1

Sony HVR-Z1 / HDR-FX1
Pro and consumer versions of this Sony 3-CCD HDV camcorder.


Reply
 
Thread Tools Search this Thread
Old March 1st, 2005, 12:13 PM   #1
New Boot
 
Join Date: Feb 2005
Location: Pasadena, CA
Posts: 6
Sony HVR-Z1U picture problem

Recently picked up the Sony HVR-Z1U and ran some tests with it. We did one test where we zoomed the camera into a lighter part of a wall, then panned over to a darker part. Apparently, the camera compensated for this difference in light and automatically adjusted the light setting. We went through all sorts of different settings (F-stop, gain, white balance) and weren't able to turn that function off. Does anybody know if this is an automatic function of the camera, or if we can turn it off? Thanks.
Jonathan Holm is offline   Reply With Quote
Old March 1st, 2005, 12:34 PM   #2
Contributor
 
Join Date: Sep 2003
Location: Santiago, Chile
Posts: 932
I have observed something similar with my PDX10, even when in full auto and everything locked, I could tell --by changes in the zebra pattern-- that some kind of AGC was in place-- but it was quite slight.

I would not call it a "picture problem" though. I would think it is more of a control problem. Something in there is out of control.
__________________
Ignacio Rodríguez in the third world. @micronauta on Twitter. Main hardware: brain, eyes, hands.
Ignacio Rodriguez is offline   Reply With Quote
Old March 1st, 2005, 12:56 PM   #3
Barry Wan Kenobi
 
Join Date: Jul 2003
Location: North Carolina
Posts: 3,863
That's a common question from brand-new FX1/Z1 users. The answer is, you have to make sure that all functions are in manual mode. There are a row of buttons along the bottom of the camera that determine automatic or manual control of iris, shutter speed, and gain. If any of those are in "automatic", the camera will do exactly what you describe. You have to set them all to manual mode, and then you will have full manual control.

It's not an image problem at all, it's the way the camera works.
Barry Green is offline   Reply With Quote
Old March 1st, 2005, 01:17 PM   #4
New Boot
 
Join Date: Feb 2005
Location: Pasadena, CA
Posts: 6
I'm pretty sure we tried setting everything to manual and it still compensated for the change in light. We tried so many different settings that i feel like it's an automatic function of the camera.
Jonathan Holm is offline   Reply With Quote
Old March 1st, 2005, 01:24 PM   #5
Regular Crew
 
Join Date: Feb 2005
Location: Indy
Posts: 160
those buttons are easily pushed, so you may have sent one back to auto and not known it.
Sean M Lee is offline   Reply With Quote
Old March 1st, 2005, 01:35 PM   #6
Contributor
 
Join Date: Sep 2003
Location: Santiago, Chile
Posts: 932
Jonathan, can you describe whether it was a subtle thing or a dramatic change in exposure?
__________________
Ignacio Rodríguez in the third world. @micronauta on Twitter. Main hardware: brain, eyes, hands.
Ignacio Rodriguez is offline   Reply With Quote
Old March 1st, 2005, 01:40 PM   #7
Regular Crew
 
Join Date: Oct 2004
Posts: 150
Yeah, sounds like something was in auto- maybe shutter? The camera won't budge in full manual mode.
Mike Tiffee is offline   Reply With Quote
Old March 1st, 2005, 02:39 PM   #8
Regular Crew
 
Join Date: Feb 2005
Location: Cape Town, South Africa
Posts: 76
The lens on the Z1 has a "variable" maximum F-stop of F1.6 - F2.2 if I remember correctly, depending on what focal length the lens is at. So if you zoom, at some point the lens will automatically adjust from F1.6 to F 2.2 before it reaches maximum telephoto. THis has to do with the construction of these fixed zoom lenses, and is apparently not unique to Sony.
__________________
Derek Antonio Serra
Indie Filmmaker
www.indv.co.za
Derek Serra is offline   Reply With Quote
Old March 2nd, 2005, 06:51 AM   #9
Contributor
 
Join Date: Sep 2003
Location: Santiago, Chile
Posts: 932
I see your point Derek and I have seen that effect with many cameras, but Jonathan said this change in exposure happened when panning, not while zooming.
__________________
Ignacio Rodríguez in the third world. @micronauta on Twitter. Main hardware: brain, eyes, hands.
Ignacio Rodriguez is offline   Reply With Quote
Old March 2nd, 2005, 07:47 AM   #10
Major Player
 
Join Date: Jan 2005
Location: Ottawa, ON
Posts: 471
My guess is the gain was not locked -- an easy one to overlook. The PD-150 was designed the same way -- you need to lock the shutter, the aperture & the gain to prevent the camera from making any exposure adjustment.

GB
R Geoff Baker 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 > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony HDV and DV Camera Systems > Sony HVR-Z1 / HDR-FX1

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 02:51 PM.


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