After the glacial melt at the end of the Würm ice age, the Breitach cut itself some 150 meters deep into the rock over the past 10,000 years, creating the deepest rock canyon in Central Europe: the Breitach gorge. It runs 2.5 km between the exit of the Kleinwalser valley at Tiefenbach, a district of the municipality of Oberstdorf in Germany, and the Walserschanz in Austria.
The Breitach shows its wild side during the melting of the snow and also during rainy days. But the rocks don't rest either: on September 23, 1959, rock fall at 6:00 in the morning around 50,000 cbm of rock and rubble. This "dam" dammed up around 300,000 cubic meters of water to a height of around 30 meters. On March 23, 1996, the breakthrough occurred at 11:30 a.m., resulting in total devastation of the walkways, stations, etc. in the affected part of the gorge.
If you walk through the gorge today, the now rusty remains of the former fortifications serve as a special eye-catcher and long exposure is particularly worthwhile in these places.
Depending on the exposure time, different effects arise, which are shown in the following pictures. The higher exposure times were only achieved by increasing the f-number to 22 and reducing the ISO number to 31 and not by using gray filters. As a result, the photos (on closer inspection) also show the expected (slight) diffraction blurs, which, however, hardly diminish the image statement.
Since I use a Rollei carbon tripod - here is a comprehensive contribution from Rollei to the technique of long exposure with interesting examples.