Is it breathing that I see? at DVinfo.net

Joachim Ljungquist · January 29th, 2010, 05:29 AM

I went outside for the first time to test the camera. Right now it's really winter and about -20 degrees Celsius (about -4 F). I zoomed in a tree at full zoom and shot for a while. When I now look at the clip - the picture kind of "waves", almost like a hot desert clip.

Is it breathing that I see?
Why/how is this "possible"?
Can it be avoided (except NOT zoom in to much or buy a new lens)?

I have the Canon HD KH19x6.7 lens (VCL-719BXS) on a F330.

Luc De Wandel · January 29th, 2010, 06:01 AM

Was there possibly a warm air current between you and the tree? Sound like hot air turbulence.

Joachim Ljungquist · January 29th, 2010, 07:11 AM

Haha... It might have been so!
I was actually standing on the balcony - with the door open. - "Big laugh!"

But anyway - what is breathing?

Alister Chapman · January 29th, 2010, 10:49 AM

Breathing is the way the image gets smaller or larger as you turn the focus ring. Most lenses exhibit some breathing as you focus.

Joachim Ljungquist · January 30th, 2010, 02:14 AM

Alister:
Ahh - so that is the name of that "phenomenon" - and a quite annoying one!
Thanks, I did not know the english word for it, even that it now seem quite obvious :)

January 29th, 2010, 05:29 AM	#1
Joachim Ljungquist Regular Crew Join Date: Sep 2008 Location: Umeå, Sweden Posts: 84	Is it breathing that I see? I went outside for the first time to test the camera. Right now it's really winter and about -20 degrees Celsius (about -4 F). I zoomed in a tree at full zoom and shot for a while. When I now look at the clip - the picture kind of "waves", almost like a hot desert clip. Is it breathing that I see? Why/how is this "possible"? Can it be avoided (except NOT zoom in to much or buy a new lens)? I have the Canon HD KH19x6.7 lens (VCL-719BXS) on a F330. Last edited by Joachim Ljungquist; January 29th, 2010 at 08:26 AM.

January 29th, 2010, 10:49 AM	#4
Alister Chapman Inner Circle Join Date: Dec 2005 Location: Bracknell, Berkshire, UK Posts: 4,957	Breathing is the way the image gets smaller or larger as you turn the focus ring. Most lenses exhibit some breathing as you focus. __________________ Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com

January 29th, 2010, 06:01 AM	#2
Luc De Wandel Major Player Join Date: May 2008 Location: Knokke-Heist, Belgium Posts: 963	Was there possibly a warm air current between you and the tree? Sound like hot air turbulence.

January 29th, 2010, 07:11 AM	#3
Joachim Ljungquist Regular Crew Join Date: Sep 2008 Location: Umeå, Sweden Posts: 84	Haha... It might have been so! I was actually standing on the balcony - with the door open. - "Big laugh!" But anyway - what is breathing?

January 30th, 2010, 02:14 AM	#5
Joachim Ljungquist Regular Crew Join Date: Sep 2008 Location: Umeå, Sweden Posts: 84	Alister: Ahh - so that is the name of that "phenomenon" - and a quite annoying one! Thanks, I did not know the english word for it, even that it now seem quite obvious :)