Re: [Leica] 90mm recommendations: Apo-Lanthar question

[Jesse Hellman <hellman@home.com>]

Regarding Rob's comment that red focuses at a plane different from that
of other colors, does this mean that there would be little use for an
apo lens in black and white printing on variable contrast papers, where
red does not register and the emulsions are sensitive to green and blue?
I think Ctein wrote something on this but I can't remember what or
where.

Jesse