title: Determination of the off-axis illumination distribution for a lens-spectral filter combination.
abstract: This paper describes a simple method of determining the off-axis illumination distribution for the camera lens alone as well as for the different lens-spectral filter combinations. The results show departures from the cosine fourth distribution in both cases.
authors.forename: A
authors.initials: A
authors.lastname: Deepak
authors.forename: R R
authors.initials: RR
authors.lastname: Adams