Abstract
The authors' numerical calculations of the relativistic mass correction in one particular case of the two-cylinder lens [3], exhibited a marked departure from values expected from a cursory inspection of the Picht equation as proposed byM. Morikawa [4]. The present more general study of the ratio of the relativistically corrected to the uncorrected focal lengths of weak lenses confirms former results and shows this ratio to be critically dependent on the location of the bounding planes of the lens. This location being largely arbitrary, the results stress again the need to treat concepts such as focal length in the limiting case of very weak lenses with some reservation.
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