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Thursday, January 31, 2008
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2 comments:
wow... just took an image with my QHY6 (ALccd5.2) from M82... without an H-alpha. So i guess it's recommended to buy an 7nm Filter ? what do you think ?
thanks for reply
Matthias, Korschenbroich (Neuss) Germany
http://www.greiner-petter.de/m82-2c.jpg
Nice image Matthias!
H-alpha brings out more details, if there is an active emission in H-alpha line.
Be warned though!
Needed exposure times are long and practical minimum sub exposure time is about 20min! You need to have a good mount, guiding and polar align for that.
H-alpha is very good filter for emission nebulae. It can bring out some active regions in Galaxies too, if there is ones.
J-P
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