The design and the imaging characteristics of wide-angle lenses are described, with reference to back focus determination. To define the characteristics of the lenses presented, an evaluation is made of the most conspicuous aberrations when wide field, angles are imaged. In addition, the mass and the volume of wide-angle lenses are dealt with critically.
"The Influence Of Back Focus Determination On Wide-Angle Lens Design", Proc. SPIE 0399, Optical System Design, Analysis, and Production, (26 October 1983); doi: 10.1117/12.935433; https://doi.org/10.1117/12.935433