Filter compensation- a question

[Joao]

Hello! I need help for a very basic question.
For a camera loaded with B&W 50 ISO film and using an orange filter I need to compensate lets say 2 f-stops.
Now the question: for the same camera and the same filter , how do I need to compensate if I use a 400 ISO film ??? Same compensation ? Different? If different, how do I calculate it ?
Thank you
Joao

 

[uhligfd]

You must have written this post in all white, or so it appears. If you wrote anything at all, i cannot see a trace of it. Can you see this?

 

[Gumby]

There could be minor differences from film to film that only specific film testing will determine, but in general the filter factor is applied the same regardless of what film is used.

For your 400 ASA and an orange filter you can set your meter to 100 ASA, or take your 400 ASA reading and adjust the aperture or film speed reading (one or the other, but not both at the same time) two stops more : F/11 to f/5.6, or 1/1000 to 1/250. If you use EV, take your the EV for your 400 ASA reading and set your camera to 2 less: EV12 on meter would be EV10 on camera.

Easy as 1-2-3!

 

[Joao]

You must have written this post in all white, or so it appears. If you wrote anything at all, i cannot see a trace of it. Can you see this?

Yes, I wrote it in white, and I can read both the OP and your reply. Should I have done otherwise??
Joao

 

[Joao]

There could be minor differences from film to film that only specific film testing will determine, but in general the filter factor is applied the same regardless of what film is used.

For your 400 ASA and an orange filter you can set your meter to 100 ASA, or take your 400 ASA reading and adjust the aperture or film speed reading (one or the other, but not both at the same time) two stops more : F/11 to f/5.6, or 1/1000 to 1/250. If you use EV, take your the EV for your 400 ASA reading and set your camera to 2 less: EV12 on meter would be EV10 on camera.

Easy as 1-2-3!

Thank you, I thought it could demand some kind of more complex calculation. Your answer made it quite clear.
Regards
Joao