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Dumbbell-Nebula (Vul)
Click on the image for a larger version
| 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 |
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webcam-guiding with MaximDSLR through 4"-FH-refractor |
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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!
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© Friedhelm Hübner, last revision: 03.12.2023