[glend (Glen)]

As I understand resolution, point source descrimination involving Airy Disks as discussed by Alex in the OP here, (ala Double splitting for example) is almost completely dependent on aperture, but contrast differences, such as the case of the Encke Gap (or Division) are not. Hence, smaller scopes with very good optics, should be able to show the Encke Gap (or Division), if seeing allows.