Celebrating Light and Optics in these difficult times of pandemic, the Portuguese Society for Optics and Photonics join efforts with the Hands-on Science Network to organize an informal digital photography contest, VI Informal Digital Photography Contest "The Light and the City".

The photos must be taken in the period May 14 to May 18, 2023, and should focus on the Light and its relation to the Town/City you live in or visited.

Photos can be digitally edited/processed.

The photos (up to 3 per participant) should be uploaded, www.optica.pt/idl2023/submissions, by May 18 at 23:59 GMT (the name of each picture file should include an abbreviated title/name of the photo and the first name initial and last name of the author). The results will be announced at the closing ceremony of the 20th International Conference on Hands-on Science (http://www.hsci.info/hsci2023/), July 21, 2023 at 12:00 (GMT).