The e-SFR (edge-based spatial frequency response), as defined by the ISO 12233 standard, is widely used in the imaging industry. It is, however, prone to geometrically distorted images captured with automotive cameras of wide angle of view, because distortion may render straight lines as curves in addition to altering the orientation of an edge. To that end, we propose the use of circular edges for SFR measurement. It combines the simple and easily accessible binary sphere patterns with the mature straight-edge SFR algorithm. It also organically integrates the directional flexibility of the radiating Siemens star pattern with the wide spatial frequency range covered by the edge-type pattern. Its omnidirectional nature also avoids the necessity of rotating the target pattern in camera module mass production. We believe it is a viable approach to the measurement of SFR of automotive camera modules, especially those of wide angle of view.