#1  
Old 02-06-2008, 11:10 PM
Zuts
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Hb filter question

Hi Guys,

I am thinking of shooting some narrowband. I have a Ha and OIII filters. If i use the Ha for red and OIII for blue would it be possible to use the Hb for green or would this be a bad choice as the OIII and Hb are very close. Normally people use SII for the other colour.

Thanks
Paul
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  #2  
Old 05-06-2008, 07:55 PM
jase (Jason)
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Paul,
If you're imaging using an OIII filter (emission lines 495nm and 500nm), you've got the blue/green covered. You're right, Hbeta isn't far off at 486nm. I'd get yourself a SII filter as the next step. You can map the emission lines to any psuedo RGB channel. SHO (Hubble) or HOS (Canada-France-Hawaii Telescope - CFHT) palettes are probably the most common. You don't need to use all three filters. Two filters work well. Depends on what you are trying to portray.
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Old 05-06-2008, 08:43 PM
Zuts
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Thanks Jase,

I will give the Hb a miss. If I want to see the horsie i will take a photo

Paul
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