Saturn and the Seeliger effect

A Philips SPC900 camera was placed at the prime focus of an f/10, 6" SCT and an AVI captured of Saturn:

Using a 1.6  x Barlow, this image was obtained:

The Saturn was imaged using a 2 x Barlow:

The ring-brightening of the Seeliger or opposition-effect can clearly be seen.

Colin Miles