Banding with the E-M5 and the 20/1.7 (incl. E-PL5, E-PM2) "continued"

Started Nov 23, 2012 | Discussions thread
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Banding with the E-M5 and the 20/1.7 (incl. E-PL5, E-PM2) "continued"
Nov 23, 2012

I would like to continue the discussion about the banding problem of the Panasonic 20mm f/1.7 lens, which can be observed when the lens is used with the Olympus E-M5, E-PL5 and the E-PM2.
The original discussion has reached the post limit and can be found here:
The banding issue has been acknowleded by Olympus, when they advised customers to "avoid high ISO settings when using that lens". [1]
5 Months later, we are still waiting for a solution to this problem. Panasonic does not seem to care at all. The lack of compatibility of the Olympus cameras with one of the best and most versatile lenses irritates many supporters of Micro Four Thirds.
The old thread started with the suggestion that the problem disappears after "warm-up" of the lens. There has been a long discussion about possible causes for this effect. One idea is that the voltage regulator is the culprit. Roger Cicala from lensrentals contributed with the dissection of the Panasonic lens. [2]
However, the lengthy technical discussion that followed did not reach a conclusion. [3]
While some people put their lens in the oven, others should apply for a patent for keeping the lens warm with "Peruvian yak fur-lined booties and a healthy dose of DPR foral hot air". [4]

However, recent posts find that the suggested "work-around" is not always effective. [5,6]
And while the image area affected by banding exhibits a reproducible dependence on the aperture position and does not show the effect at f/1.7, ...
there seems to be a second operation mode in which the banding can be seen at f/1.7. [6,7]
The lack of tracability makes it difficult to find the origin of the banding problem.
Anyone who is interested in resolving this issue is invited to join the discussion.

Panasonic GH3 owners are welcome to tell if their system does or does not show banding.

Olympus PEN E-PL5 Olympus PEN E-PM2 Panasonic Lumix DMC-GH3
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