Green tint

[Jaded62]

Hi all.

I'd appreciated some advice regarding why I have this green tint going on.

F11, 25s, ISO 100, 5Ds with a 16-35 L @ 16mm.
Filters were a 10 stop ND with 1.2 stop GND (behind) in a Nisi mount. No hood or lens protector between the lens and the filters.
The sunrise was maybe 20 minutes prior and 30° off to the left (wild guess).

I took dozens of shots with the same setup above before and after this shot with no issue. I assume the tint is to do with an angle but I haven't seen this before.

The image below is the raw file with no post processing.

Cheers.

[ameerat42]

...

F11, 25s, ISO 100, 5Ds with a 16-35 L @ 16mm.
Filters were a 10 stop ND with 1.2 stop GND (behind) in a Nisi mount. No hood or lens protector between the lens and the filters.
The sunrise was maybe 20 minutes prior and 30° off to the left (wild guess).

I took dozens of shots with the same setup above before and after this shot with no issue.
I assume the tint is to do with an angle but I haven't seen this before.

Re the point enlarged above: Do you mean you took a lot of shots all of this same scene with no issue?
AND
I presume you mean the band of green along the bottom of the frame rather than any overall tint in the
whole image. In the same vein, I could arguably see "rather reddish" tinting in the mound just above and
to the right, and extending across onto the other foliage, the shadow, and down to the beach.

If "yes", then all I can suspect is INCOMPLETE recording of the raw data when the camera was making the
image.

OTOH, if you meant you took lots of "other shots" of different scenery, then try to go back here and take a
good few in succession. See what happens then.

If it's easier, take a heap of shots of an OOF even white surface with the same setup.

[Jaded62]

Thanks for the prompt response.

Lots of shots from that area +/- a few metres and yes, the green band.

Now I've gone back and looked again I can see the green band to a lesser degree in 3 or 4 shots either side of this photo.

[ameerat42]

In that case it's starting to sound suspiciously like the filter combo

I don't think you will find any particular angle that you can set the VND filter
to eliminate this. It sounds like there's a bit of polarised light getting through
the whole combo. My nearest experience is the various colours you see when
driving with polarised sunnies and looking at scenery through window tinting.
The tinting already polarises some of the light from outside, and the glasses
then... cause the illusion...