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s58y
Postmaster
Reged: 12/12/04
Posts: 5502
Loc: Eastern NY
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Re: Which H-alpha filter?
07/01/09 11:47 PM Attachment (26 downloads)
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Second shot is with the Astronomik 13nm filter, 10 minutes, ISO400, 27% moon.
Note that the stars are larger than on the first image, despite being dimmer. Note: It's hard to focus an H-alpha shot, since only the red pixels respond well in the small star image used for focusing. You see a checkerboard pattern with mainly red pixels.
-------------------- Hutech 30D, SBIG ST-402 autoguider
SV80S, TV102iis
Old camera lenses: 800mm f/5.6, 180mm f/3.4
AP900, Barndoor tracker
http://www.pbase.com/s58y
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