Medium Format Forum

Register a free account now!

If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.

Low ISO in GFX


New Member
Dear all,

When GFX was released two years ago, from the articles I read, it was capable of ISO 50 (pulled) from the standard ISO 100, using one of the menu. But, when I bought it early this year, I updated the firmware, and it cannot go down to ISO 50, there is no button to show where it is.

Reason I want to try the low ISO is to enable long exposure with only on ND filter (6 stop).

Anybody knows how to lower the ISO?

Thank you :)


New Member
Heya. Have you tried the following?

  • Set the ISO dial to C
  • The ISO setting is now controlled by the FRONT control wheel, under your forefinger as you hold the camera to your eye
  • Press the front wheel, and you’ll be able to adjust ISO. Turn it LEFT to go down to ISO 50 pull setting

Any good?