Problem with Autofocus using Lumix 14-140mm Lens at DVinfo.net

Go Back   DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic AVCCAM Camcorders

Panasonic AVCCAM Camcorders
AVCHD for pro applications: AG-AC160, AC130 and other AVCCAM gear.


Reply
 
Thread Tools Search this Thread
Old February 20th, 2013, 06:02 PM   #1
New Boot
 
Join Date: Aug 2012
Location: Los Angeles, California
Posts: 5
Problem with Autofocus using Lumix 14-140mm Lens

Just acquired a used AF100 and Lumix G Vario 14-140 Lens. I'm getting a strange back-and-forth "shuddering/warping" in my video frame when there's any movement in the shot and the camera is set to Auto Focus. It's as though the camera is shaking or vibrating slightly (which it isn't, being that it's on a tripod). The problem disappears as soon as I switch to Manual Focus. (Also tried OIS on and off, with no effect on the problem.)

Here's a link to a brief video sample: wobble sample - YouTube

I'd appreciate any insights into this?
Rob Brookler is offline   Reply With Quote
Old February 21st, 2013, 09:22 AM   #2
Trustee
 
Join Date: Jan 2006
Location: New York, NY
Posts: 1,267
Re: Problem with Autofocus using Lumix 14-140mm Lens

Looks like lens breathing when focus changes changing the size of the frame at different focal lengths in time to your movements.
Daniel Epstein is offline   Reply With Quote
Old February 21st, 2013, 11:23 AM   #3
New Boot
 
Join Date: Aug 2012
Location: Los Angeles, California
Posts: 5
Re: Problem with Autofocus using Lumix 14-140mm Lens

Thanks Daniel. Is this "lens breathing" normal for Auto Focus ... or is it a problem with the camera or lens? If it's normal, is there any camera setting that would minimize this effect?
Rob Brookler is offline   Reply With Quote
Old February 23rd, 2013, 10:46 AM   #4
Trustee
 
Join Date: Jan 2006
Location: New York, NY
Posts: 1,267
Re: Problem with Autofocus using Lumix 14-140mm Lens

Lens Breathing is typically more noticeable on zoom lenses when changing focus. It can also be seen on prime lenses that are not designed to minimize it. If you want to see it using manual focus you should change the focus back and forth like Auto focus might do as in your sample. You should see the frame size change. This is why video lenses aren't as good for rack focus shots if you mind the size change. Cine style lenses often are designed to avoid or minimize this.
Daniel Epstein 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 AVCCAM Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 05:12 PM.


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