the exposure. If one of the "minis" is close I add or subtract,
as the case may be, some little exposure from that near
doubling. IIRC, that is the same procedure used by
those making test strips.
Once THE correct exposure has been determined an enlarging
meter will nail it for larger or smaller prints. I've an Ilford
EM-10. Darkroom Automation offers a much more
refined unit. Dan