81 Photo filter in Photoshop

[Anteros]

Anyone know what percentages of opacity of the 81 photo filter in Photoshop matches up with the 81A,B,C filters?

I usually just move the slider until I think it looks good. That works fine, but I'm still curious as to how I can reproduce the effect of the real 81A,B,C filters.

Anyone have any idea?

Thanks.

[andygrif]

I guess it would depend on the glass filter, different makes have different quality glass on them.

Saying that I generally use a density of about 20% for a filter.

Trust your eyes!

[steven]

Since the A, B, C refere to stops I would image that if you cut half the light out (i.e. 50%) that is 1 stop. Which would be A and so on.

Yes?