Simply put: Entries must have arcs (or a singular arc) as a dominant visual element. These can include circles, ellipses, or portions thereof.
The Eligible gallery is for images captured with a Canon DSLR during the Challenge period and subject to rules outlined in the Official Challenge FAQ.
The Exhibition gallery is for images taken at any time with any camera.
Enter a maximum of three pictures per person in each gallery and please remember the 150kb limit.