Narrowband Cygnus

16:41 20/10/2007 UTC

At last I got an opportunity to try narrowband filters to Cygnus nebulae. I was able to connect my filter pocket system to the front of the objective, which aids in filter changing a lot - especially in darkness. This image is from the same general area as the previous image I took and there's also OIII and SII data added. Moon and stray light caused some post processing challenges, but still I managed to pull out something. You can see familiar objects coloured in different ways in this image. Note how Butterfly Nebula emits mostly only H-alfa light. Not a very good target for tri-band narrowband imaging. Total exposure time is three hours.

Camera: Modified Canon EOS 350D | Telescope: Canon EF 50mm f1.8 objective | Mount: Orion Skyview Pro, Boxdoerfer PowerFlex MTS-3SLP drive controller | Filters: Astronomik H-alpha 13nm 2", Astronomik OIII 13nm 2", Astronomik SII 13nm 2" | Exposure: Ha: 12x300s (1h), OIII: 12x300s (1h) SII: 12x300s (1h) ISO800 f2.8, 5 darks, 10 flats CFHT Palette (Ha:OIII:SII) | Software: IRIS, GIMP | Location: 60°31'N 26°52'E (Koivula/Kotka,FI)