A William Optics apochromatic refractorwas mounted on a Celestron AVX EQ, GOTO mount. An Atik 314L monochrome 16-bit CCD camera fitted with a narrowband H-alpha filter was placed at the focus of the telescope and AstroDMx Capture for Linux was used to capture 16-bit FITS files with matching dark frames of the Horsehead and Flame nebulae and the Rosette nebula.
The Horsehead and Flame nebulae stack of 40 x 60s exposures
The Rosette nebula stack of 16 x 60s exposures
Full details of the tests and more images can be seen HERE
Steve Wainwright and Nicola Mackin
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