Four hundred photographers are pounding the city’s streets competing in this year’s Photomarathon.
The photography extravaganza sees budding snappers given 12 hours to come up with great photos on 12 topics around Cardiff.
Topics given out by the judges include inside out, super powers and community as amateur and professional photographers alike try to find something in the city which represents the topic.
Photomarathon organiser Mathew Talfan says its exciting to see what people come up with.
He said: “In essence this is a photography competition but it’s much more than that. The challenge is to find something different which represents your 12 topics.
“Those who take part in Photomarathon always tell us it’s a tough events, you have to be creative and also have a fair bit of stamina.”
Watch Matt Talfan explain what the Photomarathon is and we speak to some of the entrants
The thousands of photos will be downloaded at the end of the day and the judging process begins.
Mr Talfan said: “There’s seven organisers and we set the topics, a combination of many meetings to come up with them.
“It’s wonderful to see how people interpret those and to see all the entries come in.”
The event began with registration at the Wales Millennium Centre where 18-year-old Cara Berg from Penarth was gearing up for a busy day.
She said: “I take part with my family and we’ve done it for a couple of years. It’s really fun.
“When we see a good photo it takes some organisation between us to sort out who is going to do that idea.”
Ann Bradley, from Roath, was taking part for the first time.
She said: “My children took part last year and they came back to the house and were trying to think of ideas.
“I was coming up with a lot of them, so I decided this year to enter. I’m more about the inspiration than the photography.”
Nicola Davies, from Whitchurch, was re-entering after enjoying her first time in 2010.
She said: “I think it’s a really good idea. I saw all the photos online and really liked it.
“It’s a struggle to keep your inspiration going over the 12 hours, but I like the challenge.”
All the entries will go on display at the Cardiff Story Museum from July 30 for three weeks.
Have you taken part in the Photomarathon? How did you get on? Let us know in the comments below