retrofocus wrote:
I have observed the green shift on my M-E 240 only when severely pushing shadows. You are hitting a green banding issue then. It was a common issue with sensors made at this time due to limited dynamic range.
I was going to mention the green shadow shift but thought it would be getting too deep into the weeds. Back at the time someone in the UK released a LR plugin that would generally neutralize the effect but the last time I checked it was no longer available on the internet.
The green shift happens until the transition between ISO 800 and 1000. And it is more noticeable the less you push a file, the closer it is to ISO 800. Basically you'd push an ISO 200 file a few stops to see the same green shadows effect as pushing ISO 800 files a stop. If at 800 it would be better just to switch to ISO 1000. But the tradeoff, at least with the base M240 (not sure about the M-P or M-E) was that transition also roughly halved the effective buffer depth.
I basically ran all my M240 files through the green shadow fix plugin. I haven't yet examined SOOC M240 DNG files processed through AI NR, such as Adobe's Denoise, to determine if that has any affect or cancellation of the green shadow shift...
EDIT:
I pulled a few recent M240 files from the last time I used it to have a closer look. All were ISO 200 files. In LRC 14.5.1 I pushed them at least 4-5 stops (way beyond what was necessary) and/or also pushed shadows to 100 and did not see any green shadow shift. Running Denoise on the files cleaned up the grain but the subtle sensor banding that was visible in some areas was not removed.
In any case, when I was running the green shadow fix plug-in, it was in the LRC v6 and older standalone apps. It's possible at some point between then and now that Adobe has incorporated an equivalent to the green shadow fix to their current handling of M240 DNGs. Without examine a pile more images across many ISOs, it would seem the green shadow shift is no longer an issue.
Sep 04, 2025 at 04:33 PM
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