Hexar AF with ND-filter?

[Landberg]

Hi!
I have used the Hexar AF for a long time but i have never used it with a ND-filter. If i use a 8X ND-filter i need to adjust the ISO 3 stops i guess? I like shooting tri-x at 1600, so if i use a 8X filter i will have to set the camera at ISO 400, right?

If i´m wrong please explain to me!😉

 

[daveleo]

Here is my thinking.
Tri-X is ISO 400. You shoot it at ISO 1600 which underexposes it 2 f-stops (400>800>1600).
If you use a 3-stop filter and shoot it at ISO400, Tri-X will be underexposed 3 stops, which means (I believe) you need to shoot it at ISO200 when you use the 3-stop filter and want to underexpose it only 2 stops.

🙄

 

[Landberg]

Of course! 🙂 thank you!
My plan is to use the ND filter during daytime and no filter during the night.