Horsehead M42
The Trapezium

(Click on image for Full Resolution)

Date: December 14, 2004
Exposure: LRGB : 60:120:180:450
30 x 2s L, 30 x 4s R, 30 x 6 s G & 30 x 15s B
Processing: Guided and acquired with CCDSoftV5. MaxIm for Image calibration,(20 flats each LRGB, dark subtracted and median combined, 40 bias frames median combined, 20-900s darks Sigma Reject combined), alignment, normalization, color combining. 5 iterations of CCDSharp for the Lum. Photoshop CS for final color balance and jpg conversion.
Conditions: Average, Mag 3-4 Skies
Scope: C14 @ F/11
Camera: SBIG STL-1301, -20°
Comments: This was another test of the new STL-1301 camera. I wanted to see how it responded to short exposures on a bright object. Each LRGB exposure was set by testing how long I could go before blooming started on the central stars. The seeing was not really good on this night, but the short exposures helped limit its impact.