Winners of Photomarathon Sheffield will be chosen based on their creativity, humour and spontaneity.
The prize for the overall winner is a Leica camera.
Topic winners will receive Harrison Cameras vouchers and a place at a Leica Akademie workshop.
Runners-up in each topic will win a place at a Leica Akademie workshop.
The best set of photos taken on a smartphone will win a compact camera.
The best set of photos taken by an under-16 entrant will win an instant camera.