m51 H-Alpha question

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m51 H-Alpha question

Postby beckemd » Fri Jul 04, 2014 6:04 pm

Query: where have I gone wrong...?
Took a stab at H-alpha for the first time yesterday. Polar alignment/tracking with PHD working well. IMaging through the Stellarvue 90mm. Camera was an unmodded Nikon D7000. FIlter was a 7nm Baader H-alpha 2inch. Took 3-5 min sub with my Light polution filter...good view of M51. Used a Bartov mask for focusing. THen turned to H-Alpha. 10min then 20 min exposure at iso 400 looked dreadful, very grainy not much detail at all...
Is it a aperture issue? Is it a "RGGB" Debayering issue? Any help appreciated.

Lastly, How do you link/post pics for others to critique or comment?

TY

Dave in Chicago

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Re: m51 H-Alpha question

Postby Zakalwe » Fri Jul 04, 2014 6:16 pm

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Re: m51 H-Alpha question

Postby beckemd » Fri Jul 04, 2014 7:28 pm

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Re: m51 H-Alpha question

Postby julianr » Fri Jul 04, 2014 7:30 pm

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Re: m51 H-Alpha question

Postby crose01 » Sun Jul 06, 2014 8:29 pm

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Re: m51 H-Alpha question

Postby julianr » Sun Jul 06, 2014 8:31 pm

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Re: m51 H-Alpha question

Postby galactic_eagle631 » Fri Sep 12, 2014 1:52 am

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