Real non AI with ZEISS DISTAGON F2.8 15MM Sample Photo 402825 By laowai

Hi Rene,
the exposure time is 30 s at f/2.8, ISO1600. This is a composite using StarStaX, about 150 exposures.
Sorry for the dashed trails. This is because I cannot switch off the noise reduction for exposures over 1 s on the Leica SL. I think pretty much any other camera allows users to switch off noise reduction, the Leica SL does not. In other words, as much as I love the Leica SL, for long-time exposures of star trail the camera is essentially useless.

Hi, this is a cool picture. Do you know the exposure time, and why the trails are dashed? Thanks. René.