M42 - The Orion Nebula (Ha:OIII)

19:43 15/12/2006 UTC

I got my OIII filter few days ago. I wanted to try bicolor narrowband imaging with H-alfa and OIII filters. Unfortunately I had just replaced my focuser (and lost the finder base) and couldn't use my finder, because a little mechanical problem. M42 was only Emission nebula I could find into Canon's chip without finder so it had to be the target. M42 is very difficult to image and visible only for about one and a half an hour from my backyard. Nothing special, but my very first Ha:OIII image!

NGC/IC Object List:
NGC1976 gaseous nebula RA:05h35m17.1 Dec:-05°23m'25" BMag: 4.0, M 42 Orion Nebula
NGC1977 open cluster RA:05h35m18.0 Dec:-04°49m'00" BMag: , OCL 525
NGC1980 gaseous nebula RA:05h35m25.8 Dec:-05°54m'37" BMag: , OCL 529
NGC1981 open cluster RA:05h35m09.5 Dec:-04°25m'30" BMag: , OCL 525
NGC1982 gaseous nebula RA:05h35m31.3 Dec:-05°16m'03" BMag: 9.0, M 43

Camera: Modified Canon EOS 350D | Telescope: Skywatcher ED80 Pro 80mm f7.5 refractor, William Optics 0.8x focal reducer | Mount: Orion Skyview Pro, Boxdoerfer PowerFlex MTS-3SLP drive controller | Filters: Astronomik H-alpha 13nm 2", Astronomik OIII 13nm 2" | Guiding: Orion ShortTube 80mm f5 refractor, QCGuider, Teleskop-Service 1.5x Barlow, Phillips ToUCam Pro II webcam | Exposure: 9x300s (45m) ISO800 f6 (Ha), 6x300s (30m) ISO800 f6 (OIII), 4 darks, 10 flats, bias. Ha:OIII:OIII Mapping | Software: IRIS, GIMP | Location: 60°31'N 26°52'E (Koivula/Kotka,FI) | Image Field: 2.112 x 1.584 degrees | Image Center: Ra 05h34m59s Dec -05°18'06" | Target altitude in the beginning of the exposure 18°