Fig. 5: A Super Puma helicopter. Using a longer exposure time one can see the motion blur of the rotors. If it's too short, then it lools oddly frozen in the sky. Air field Birrfeld. — EXIF: Nikon D3; Δt=1/60 s; f=400 mm; f/32.0; ISO 100; 2012-02-25 13:41:53
