Quote Originally Posted by david b
I can't believe I am getting myself so confused but let me ask a question:

If I meter a shadow with a spot meter, I am getting zone V. If I place an orange filter on the lens, this effectively brings the shadow down to zone III, right? So I should not make any adjustments, right?
It might be less confusing if you take it one step at a time.

1) Take the reading.
2) Close down two stops to place it on Zone III.
3) Adjust the exposure for your filter factor or actual light attenuation.

It is a bit faster to try to do it all at once but I think it sometime leads to this kind of confusion.