Hi Guys,
I think I want to do some L RGB imaging. I plan on getting a Ha filter to use on the SBIG 2000 XCM and then use the camera unfiltered for the RGB.
Currenty I have Astronomic UHC and OIII visual filters and I find them very good quality. I was thinking of getting the Astronomic Ha 6nm 1.25 inch filter. However when I look at the following and I assume the 2nd filter is the 6nm Astronomic, while the 1st is the 13nm
http://astrosurf.org/buil/filters/curves.htm#stronomik CCD Ha filter it appears that the Ha filter is shifted towards the blue.
This may be an old filter and the new ones may be far better. What do you guys think are Astronomic 6nm CCD filters good for imaging. My other option would be to spend a bit more and get the Astrodon
http://www.optcorp.com/product.aspx?...-1157-861-4060
If the Astronomic is OK i would rather get it. Any help appreciated, what do you guys think.
Paul