Dumbbell-Nebula (Vul)

Dumbbell-Nebula (Vul)

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Date/Site: September 12., 2007, Rifugio Monte Muro, Maurerberg, Southern Tyrol
Exposure/
Filter:
25 minutes
Camera: Praktika, 200 ASA Kodak slide film
Optics/
Instrument:
180 mm Zeiss Sonnar, stopped down to f4,5; piggyback on Gemini 41 Observatory mount
webcam-guiding with MaximDSLR through 4"-FH-refractor
Scanned, levels and curves in Photoshop CS

The odd small red Dumbbell-Nebula is a wonderful proof for the extreme red-sensitivity and the slow blue-sensitivity of the Kodak-slide films. And this is the reason why the severe chromatic aberration of the old lenses dosn't show up with these films: they simply do not record the blue haloes!

© Friedhelm Hübner, last revision:  03.12.2023