Angry clouds above Prague

Sometimes you just hope for an interesting sky, and sometime you get it. This was a complete surprise. Few moments before this clouds appeared, the sky was almost completely clear. I took this from the top of the Old town hall tower in Prague. I also wanted to zoom in more on the castle, but as I currently don’t have a telephoto lens for my 5D, I stuck with wide angle shots. Btw. the clousds are not HDR, there are completly from one of the exposures :)

Number of exposures: 7; Camera Model: Canon EOS 5D Mark II; Lens: Canon 16-35 mm F2.8;
Focal length: 35 mm; Aperture: 2.8; Middle exposure time: 2s; ISO: 100; Tripod used: yes

Where was this photo taken:

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