[1] At the age of 20, Fischer returned to Luxembourg and started a practice on the Grand-Rue which he later moved to a building near the Brasserie Pôle Nord adjacent to the Pont Adolphe.
In 1942, after being deprived of his licence by the occupying Nazis on the grounds that he was too supportive of the French, he practiced on the corner of Boulevard d'Avranches and Avenue de la Gare.
After making all the calculations, he would order the necessary lens elements from a local optician and encase them in varnished home-made papier-mâché tubes, providing equipment of a type which at the time could not be obtained commercially.
His shots often convey an unusual liveliness as he managed to catch his subjects in the course of their normal activities, sometimes amusingly portraying their leisure moments.
Every weekend when he was free to walk around the town, Fischer would take the most recent examples of his work to the local authorities and receive a few hundred francs on condition he wrote a short description of the historical context on the back.