Two cameras were in action. One employing a 8 mm fish-eye lens, the second dslr was equipped with a 15 mm fish-eye lens holding a diffraction grating. As described in the caption below.
A cropped section of the image obtained through the 8 mm fish-eye lens. Exposing the field at the same time as the meteor was captured through the diffraction grating. Unfortunately some dew on the lens. Therefore not top image quality.
Spectrum obtained on August 21, 2015. At 01.46 local (daylight savings) time (UTC+2).
Photo details: Canon EOS 650D, Sigma 15 mm fish-eye lens, Diffraction Grating Double Axis 13,500 lines/inch Laser Spectrometer.
ISO: 3200. Exposure: 50.2 seconds.
A more close up:
A cropped version of the image above.
The northern sky was electric blue-white in the early hours of August 4, 2015 because of a beautiful display of noctilucent clouds.
Beautiful NLC structures over the mountain peaks. Here is a photo of the display taken on August 4, 2015.
Photo details: Canon EOS 650D, Sigma 50 – 500 mm, tripod, remote controller