Quote:
Originally Posted by Merlin66
Bert,
I think the real issue isn't the optical accuracy of the filters- there are many good ones out there - it comes down to the availablity of the filter bandwidths...
Also, using very narrow band emission filters would limit the amount of "additional" starlight which would be recorded. Ha emission (other than Doppler shift issues) is only a few Angstrom wide......
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I think we are at crossed purposes here. What do you mean exactly?
Bert