本帖最后由 kson 于 2010-2-26 10:49 编辑
The sky conditions that evening was fair for a city location down to mag 5 .
Filter: The filters used for the Horsehead was a composition of R G B for colour information and an Astronomick H Alpha filter for the image luminance .
Exposure: The exposure times was twenty minutes for each colour filter and two hours in H Alpha . The exposures was a composition of two minute exposures stacked with matching dark frames using deep sky stacker software and retuched up on Paint Shop Pro software.
Camera: The camera was an Atik 314L CCD camera
Mount: mount was a Vixen Atlux mount .
Scope: Ekinox (Kson) ED805.5 |
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