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Re: [OM] Portrait shot - need lens opinion

Subject: Re: [OM] Portrait shot - need lens opinion
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sat, 24 Oct 2015 08:20:15 -0400
I think your results tend to support the idea of weak electrical interference from the lens. Whatever banding is there is only visible in very dark areas where the light signal is very weak and possibly overridden by the electrical interference.

Chuck Norcutt

On 10/23/2015 11:12 PM, Moose wrote:
On 10/22/2015 3:58 PM, Frank wrote:
If you shoot with an E-M5 and use high ISO (800 and higher), then
the 20mm - E-M5 combo suffers from quite severe banding! Please test
for yourself...

Yes, test. Some people seem to have more trouble with banding than
others. Whether sample variations, camera settings, phase of the moon,
or whatever, I don't know. I'm far from home, so can't check.

On 10/23/2015 4:23 AM, Frank wrote:
Maybe indeed only little. The 20mm was announced only 3 month or so after
the announcement of the E-P1. Panasonic had probably no or only a limited
way of testing it against an Olympus camera. And it became an issue with
the E-M5,

Not quite so. I noticed it with the E-PM1. I got slight banding in the
deep shadows when shooting more or less in the dark.

I took some quick, casual test shots with E-M5 II last night, all at ISO
3200, - 2/3 EV.

This was shot in a very dim room. Histogram only gets 1/3 of the way up.
So the corrected version has been pulled waaay up. I can't really tell
brightness on this narrow angle screen, so I've included two different
brightnesses. The lighter one is closer to the original and the test for
banding. I just can't see any that isn't in the original drawing.
Unevenness of illumination is reflections of me and stuff behind me.

This carpet is very poorly lit, with some light spilling through from
another room, so it's dark, darker and darkest. I've really pulled up
the shadows, and there is certainly some banding on the bottom, the
darkest part, but none elsewhere. If for other than testing, I'd be
using something closer to the dark version.

A very different subject, backlit with late dusk light. This has also
been pulled up from underexposure, but doesn't look it. I can't see any
banding. <http://zone-10.com/tope2/main.php?g2_itemId=19024>

With this particular 20/1.7 and E-M5 II, I have to say that banding
isn't a practical problem.

so Olympus obviously had some time to take countermeasures.

I do wonder what they would be and what they would cost, both in $ and
delayed production. I can see cost-benefit concluding that special
efforts to accommodate a minor problem with one lens are not worth it.

On 10/23/2015 6:14 PM, Mike Gordon via olympus wrote:
Very odd issue and reported early on with E-M5 but  also seen on
E-M10.  There are some reports of substantial lens to lens  variation
in the banding as well.

I've been wondering if Frank has a particularly bad one. I'm also
curious about the second version. It looked to me like a straight
cosmetic redo, but could have included some electronic change(s), as well.

Scarcely Banded Moose

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