Overlaying images

1

Evenin’. Less of a flash question here, more common sense. I’ve got 10 images that are piled up on the stage. One on top of the other. I want them all to be as visible as each other, so I need to alpha some down. What i cant do is work out how much by. I know they cant all be 10% as the one at the bottom of the pile would be hidden by 9 x 10%s, so I thought 100% for the bottome, 90% for the one on top of that, 80% etc etc. But the ones at the bottom still seem to get lost under the top of the pile with the lowest alphas. Am i just being paranoid, or are my maths all wrong?! Thanks in advance, this is driving me crazy!