Panasonic Lumix G 20mm F1.7 II (H-H020A) - Banding

Started Aug 6, 2013 | Discussions thread
s_grins
s_grins Forum Pro • Posts: 13,255
Re: Panasonic Lumix G 20mm F1.7 II (H-H020A) - Banding

Anders W wrote:

YuriS wrote:

s_grins wrote:

I do not think this is the lens to blame. I think this is a sensor problem. Can you, please repeat you findings with different lens under identical conditions (especially ISO 6400)?

Hi! I discussed the issue once at DpReview so there are my opinions:

There is a lens issue - induction impact of huge spring assembled into the lens. Please see it here:

http://www.imaging-resource.com/news/2012/10/29/dissected-panasonics-lumix-g-14mm-and-20mm-prime-lenses/

Why - Just facts:

1. It is related ONLY to Pana 20mm f1.7. No other lens have it.

2. It appears only at high ISO, then sensitivity of sensor is very high. Electro sensitivity means not only sensitivity to light, but sensitivity to other electromagnetic waves, so the spring may work like a inductor / antenna.

3. As everybody know it cannot be solved by firmware update – means problem not in programming but in physical impact.

Of course I cannot prove it, I need to disassemble my Pana 20mm f1.7 – never do it! But maybe somebody who has enough experience will try to figure it out.

Original tread: http://www.dpreview.com/forums/post/50606731

Pictures: http://natalispalette.jimdo.com/photo/panasonic-lumix-g-20-mm-f-1-7-asph-lens/

It's a lens-and-sensor issue. A certain sensor (the newest MFT sensor) and a certain lens (the 20/1.7) together results in banding. Use another lens or another sensor and the problem disappears (or is much less common/prominent).

I am not sure the spring is involved though. I am not afraid to open up my 20 and temporarily remove the spring (I have already done that for other reasons) so I might eventually get around to testing whether it makes any difference with regard to banding if the spring is there or not. But no promises.

Anders, try instead another lens under identical conditions.

Spring inside the lens is a pure mechanical  with the purpose to eliminate flex between moving parts

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