Tom, why do you believe that anti-reflection coating has anything to do with color correction, i.e., designing out chromatic aberrations? I've seen this idea pop up all over the place and it just baffles me.
The one time it sort of made sense was with reference to Boyer Saphir enlarging lenses, for which the claim has been made that a redesign that reduced chromatic aberration occured at the same time Boyer began coating lenses. But in this case coating is an indicator, not the cause.
Cheers,
Dan
You don't need a Speedex, you need a nice Selfix. Take two Selfix, go to bed, and you'll feel better in the morning. Take two Speedex, and you'll wake up with nasty regrets.