The Rosette in Black & White
- Telescope: Stellarvue SVA130T-IS
- Mount: Losmandy G-11 with Gemini 2 controller
- Autoguiding: Yes
- Optical Configuration: 0.72x field flattener & reducer (f/5)
- Filter(s): H-alpha narrowband (Baader 7-nm); O-III narrowband (Baader 8.5-nm)
- Camera: ZWO ASI1600-MM Cool
- Light Frames: 70, 2-min. O-III subs; 50, 2-min. H-alpha subs
- Calibration Frames: 50 darks, 100 biases, 30 flats per filter
- Total Exposure Time: 240 min. [(70 + 50) x 2 min.]
- Gain: 75
- Sensor Temperature: -10° C
- Pre-Processing: PixInsight, DeepSkyStacker
- Color Mapping: Luminance Channel = 80% H-alpha; Red Channel = 100% H-alpha; Green Channel = 40% O-III; Blue Channel = 40% O-III
- Processing: Photoshop CC
- Imaging Location: Los Angeles, Calif.
This black-and-white image of the Rosette Nebula has been processed from the color-mapped version originally shot in H-alpha and O-III light.