Started this thread for a discussion on banding issues at the bottom of landscape photos, when using ND filters such as ND110 or Hoya ND400, after night86mare pointed out on the issue. Trying to pinpoint what could be the cause, and what may be done.
Enclosed some sample pictures for discussion:
Pic1 - ND110, banding issue quite clearly seen at the bottom 20% of this photo
ISO: 200
Exposure: 182.9 sec
Aperture: 9.0
Time: 6:56am
Pic2 - ND110, less banding when exposed more
ISO: 200
Exposure: 241.6 sec
Aperture: 11.0
Time: 7:03am
Pic3 - ND110, problem also happens with bigger apertures
ISO: 200
Exposure: 68.8 sec
Aperture: 7.1
Time: 7:04am
Pic4 - An earlier pic
ISO: 200
Exposure: 176.1 sec
Aperture: 5.6
Time: 6:48am
Pic5 - without filters; the key could be because of lesser amount of light available at the bottom part of the photo even without filter
ISO: 200
Exposure: 1/80 sec
Aperture: 7.1
Time: 7:06am
Enclosed some sample pictures for discussion:
Pic1 - ND110, banding issue quite clearly seen at the bottom 20% of this photo
ISO: 200
Exposure: 182.9 sec
Aperture: 9.0
Time: 6:56am
Pic2 - ND110, less banding when exposed more
ISO: 200
Exposure: 241.6 sec
Aperture: 11.0
Time: 7:03am
Pic3 - ND110, problem also happens with bigger apertures
ISO: 200
Exposure: 68.8 sec
Aperture: 7.1
Time: 7:04am
Pic4 - An earlier pic
ISO: 200
Exposure: 176.1 sec
Aperture: 5.6
Time: 6:48am
Pic5 - without filters; the key could be because of lesser amount of light available at the bottom part of the photo even without filter
ISO: 200
Exposure: 1/80 sec
Aperture: 7.1
Time: 7:06am