In an achromat with C-like focal shift curve, the eye automatically picks the folding point as the point of the best focus (green light). Now, in a triplet APO with S-like curve, will there be two best focus points, one for each folding point - one for red, and one for blue? I'm primarily interestied in the real life experience, so doublet owners please don't bother 
Dmitri
Dmitri