An experiment with narrow band imaging.
So I got the new camera, a Canon 1000D, and I also picked up an Astronomik 12nm Hydrogen Alpha CCD Clip-In Filter for Canon EOS Cameras. Can the name be more of a mouthful? Technically, I think 12nm is more of a medium band filter, but still it seems to be referred to as a "narrow band filter", so I'll call it the same. But I'll be calling it the Ha filter from here on out.
The bottom line objective here is to increase imaging productivity by implementing a narrow band filter that can be used during a full moon. The image acquired during this time will then be added as luminence data to normal one shot color (OSC RGB) images I'm taking either here or in the desert.
The Pictures In This Gallery - NGC 281
I've only had it a few days and so far only one test subject has commenced. NGC 281 happens to be a subject that I have a 2 hours of OSC RGB on, it has a very nice dust lane and interesting structure and it responds well to Ha, so it's my target for now. Currently the moon is full, which - for the first time since I've been observing - is GREAT! A perfect test.
The images I'm posting in the gallery are of the original shot, the Ha shot, and the combined shot. I'm just now learning how to do the processing of Ha shots and the combining techniques into the OSC RGB shots, so I'm on a learning curve, but I think the first light results are pretty good and I'm totally stoked about the potential here.
Picture 1 - 01-NGC281-2h.jpg
This is a 2 hour shot during a new moon weekend in a dark sky. I was very pleased with this shot as it was though I wished I had more time on it to bring out the fainter details of the structure.
Picture 2 - 02-NGC281-Ha-2h30m.jpg
This is the ha only data shot during the full moon which was not only
extremely bright, but it was only 43 degrees away from NGC 281!
Picture 3 - 03-NGC281-HaRGB-4h-30m.jpg
The combined shot using Ha as luminance and OSC RGB as color.
Scope: Vixen R200SS 200mm @ f/4 w/Vixen R200SS Coma Corrector
Mount: Orion Sirius EQ-G with GoTo
Guiding: Meade DSI Pro and PHD Guiding
Guide Scope: William Optics ZenithStar 66 SD
Camera: Canon EOS 20D (unmodified) for OSC RGB and Canon 1000D (Modified) for Ha data
Special Settings: None
Exposure: 2 hours OSC RGB (24 x 300s) 2.5 hours Ha (18 x 600s)
Processing Software: Acquired in Nebulosity with high dithering, Stacked in Deep Sky Stacker (Kappa-Sigma Clipping for all frames), Levels, Curves, Astronomy Tools, Gradient XTerminator and Noise Ninja in Photoshop
Support Files: 24 flats, 24 bias, one dark used as a bad pixel map
See Gallery below for image