Flickering while zooming with the 14-140mm is not eliminated with the GH2

[bebu]

The problems I've noticed in the exposure and focussing of the GH1 while zooming with the 14-140mm are not eliminated until now. Even the GH2 seems to have these problems.
Here are some examples. All is set to manual control. The f-stop is not wider than 6.3.


http://www.youtube.com/watch?v=2Q9eftFelxc


These examples are taken with the new objectiv firmware 1.3. The originals are made in 720p50 and 1080p25
http://www.youtube.com/watch?v=YAAbxKfkxes


http://www.youtube.com/watch?v=wEULl7X3Fcg


When I analyse the exposure with a histogram or waveform monitor I notice the following.
Within 2 to 3 frames tones are shifted by minus 10 to minus 20, they stay for 6 to 8 frames and are getting back within 1 to 2 frames to the original tones.
Another problem is the losing of the focus for a short time even though it is set to manual.


This example is a professional test
http://www.youtube.com/watch?v=8SGVmtg4RFY
You can see the flickering starting at 1:15.


I've described the problem in some forums and was in contact with the german panasonic support – no solution. From the international panasonic support I've got no answer.


The proposal in the following thread doesn't work
http://www.dvxuser.com/V6/showthread.php?175638-Flicker-while-zooming-video-low-light/page4


And now I've found an example shot with the GH2:
http://www.youtube.com/watch?v=u-3uLM1WSk4


Flickering and losing focus!


I'm a little bit astonished, that the problems are not discussed more often.


But please don't answer zooming is not professional.

 

[J Davis]

it's not the camera its the lens. you can't zoom shot with a still lens dude, they aren't designed for it
if you want to get scientific you will notice that all those flicker points are the exact points on the focal length where the lens changes aperture
even if you stop down the lens so it remains at constant aperture along the length of the zoom you will see the flicker at those same points

 

[MR Fanny]

yep...its the lens. never was the body. its aperture change as mentioned from a stills lens. doesnt work like a tv zoom lens

 

[Adventsam]

Actually if you look at the Sony a55 footage, with standard stills lens and on nex5 they seem to achieve seemless zoom! Plus am sure on ia mode with the GH1 you can zoom with no flicker or exposure bumps, try it.