H Alpha Filters

[multiweb (Marc)]

Originally Posted by gregbradley

A couple of thoughts.

On another point I havn't found that outlier data rejection of CCDstack to be that useful. Perhaps I am doing it wrong. How do you get it to select satellite trails or even hot pixels or odd shaped stars? It seems to not pick them up at all or pick "everything up" to be corrected.
Greg.

You can use the "paint tool" in CCD Stack to manually reject what you don't want. It's under the data rejection drop down "free hand draw".

[gregbradley]

Thanks for the tips with CCDstack. I'll check those out.

As far as Ha filters go my 5nm Ha Astrodon leaves the 7nm Baader for dead unless I just got a bum Baader which in itself
indicates their quality control may not be up to the job.

Greg.

[bluescope]

Does anyone know about this filter ... what bandwidth etc ... can't find any info ?

Lumicon Night-Sky H-Alpha Filter for photography 1.25-inc

[jase (Jason)]

No, these Lumicon filters have a broad bandpass originally designed for use with TechPan 2145 film. While hypersensitised TP was very sensitive, putting it behind a narrowband Ha filter i.e. 6nm wasn't effective. Hence the reason why they developed a broader bandpass type filter. With the sensitivity of today's cameras, its some what a mute point. You could still use the filter, but it would not offer the contrast of the emission line that you would be seeking.

[bluescope]

Originally Posted by jase

No, these Lumicon filters have a broad bandpass originally designed for use with TechPan 2145 film. While hypersensitised TP was very sensitive, putting it behind a narrowband Ha filter i.e. 6nm wasn't effective. Hence the reason why they developed a broader bandpass type filter. With the sensitivity of today's cameras, its some what a mute point. You could still use the filter, but it would not offer the contrast of the emission line that you would be seeking.

Your are a regular font of information as usually Jase .... so thanks for that.