GH13 Lumix 14-140mm stepless aperture change Fix?

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xenogears

Well-known member
Hi friends;

Recently i do a test with the Lumix 14-140mm in my GH13, my camera is using the following parameters:
- Emory´s settings for the Fixed-Pattern-Noise-Breakthrough.
- New Kiselev Vitaliy Ptool 3.55d.
- Blackout-Powell Ipowel 24p Native Patch version 2.

Now zooming with the lens, results in no aperture jumps using those settings. If anyone can confirm this test and give us better ideas of why this is happening, how the camera is correcting these changes at the aperture.

Let the discussion begin.
 
As you said the aperture is step-less on this lens, but what is happening with Emory settings is the ISO is adjusting.
 
CColton said:
Can you explain what you mean by "no aperture jumps"?
Click to expand...

Normally when you´re zooming with the Lumix 14-140mm you see some changes on the luminance of the image, some users says this is happening because the lens is adjusting the aperture, but is a kind of weird because even with the aperture fixed at 6.0 or more you see this changes in zooming, and this is one of the reasons many users don´t like the 14-140mm.

I will try to up a video with the test to better explain.

Cheers.
 
Electronic zooms like the Lumix 14-140mm are not built like manual-focus zoom lenses, which were designed to mechanically maintain a constant aperture while zooming. The zoom and focus mechanisms in Lumix lenses are not truly independent - both focal length and focus are affected whenever the zoom or focus rings are adjusted. In addition, the lens relies on the camera to continuously monitor and fine-tune the internal iris adjustment to maintain the simulation of a constant aperture setting while zooming. If you zoom too quickly, the camera may not be able to keep up, and there may be a perceptible time delay in the iris adjustment.
 
lpowell said:
Electronic zooms like the Lumix 14-140mm are not built like manual-focus zoom lenses, which were designed to mechanically maintain a constant aperture while zooming. The zoom and focus mechanisms in Lumix lenses are not truly independent - both focal length and focus are affected whenever the zoom or focus rings are adjusted. In addition, the lens relies on the camera to continuously monitor and fine-tune the internal iris adjustment to maintain the simulation of a constant aperture setting while zooming. If you zoom too quickly, the camera may not be able to keep up, and there may be a perceptible time delay in the iris adjustment.
Click to expand...

Thanks Ipowell, nice explain as usual, but my question is, why this not happen when is in auto mode? using the Emory´s settings for the Fixed-Pattern-Noise-Breakthrough and the iris chance does not happen.

Cheers
 
Finally i can upload a test using this settings
- Emory´s settings for the Fixed-Pattern-Noise-Breakthrough.
- New Kiselev Vitaliy Ptool 3.55d.
- Blackout-Powell Ipowel 24p Native Patch version 2.

Please look at difference in luminance changes.
http://www.vimeo.com/25437198

 
Last edited:
xenogears said:
Thanks Ipowell, nice explain as usual, but my question is, why this not happen when is in auto mode? using the Emory´s settings for the Fixed-Pattern-Noise-Breakthrough and the iris chance does not happen.

Cheers
Click to expand...

My guess is that in auto mode where both the aperture and ISO are floating the lens/camera is able to smooth things out better then while in manual mode with a fixed iso/apature where is it trying to hold a given aperture during a fast zoom.

I wonder what Shutter priority mode with a fixed ISU looks like? The auto ISO might help too?
 
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