title: MTF Maximization at Low Spatial Frequencies.
abstract: A merit function suggested by Lenskii has been generalized to make it applicable to optical systems with noncircular and/or partially obscured apertures. An independent derivation makes clear the relation between Lenskii's merit function and one due to Hopkins. A slight modification of the merit function relates it more accurately to the MTF.
authors.forename: A
authors.initials: A
authors.lastname: Offner