
The size of Airy disks and circles of confusion can be optimized for any depth of field required as represented in this slight modification of the view camera focusing equation (equation #38 in http://www.largeformatphotography.in...DoFinDepth.pdf):
N_max ~ 20 / (1 + m) sqrt(dv)
Nmax = F number
m = magnification
dv = focusing leeway on the baseboard, represented as the distance on the enlarger column between good focus on the highest and lowest portions of the curved or askew negative. (if 'dv' is zero then your negative is not curved or enlarger/baseboard/easel is not askew)
20 = constant for circle of confusion about 0.15mm on the print