Quote:
Originally Posted by strongmanmike
Hi Allan, see below re FWHM and I use the 6nm Astronomiks in the Starlightxpress camera.
Mike
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Thanks Mike,
my calculations reveal that 6nm is OK where as a 3nm filter would
have been too narrow to pick up Ha given the recession velocity at 61 Mly away.
Redshift 0.005347
https://en.wikipedia.org/wiki/NGC_1232
As for FWHM my Maxim DL can measure it straight off
the FITS files 10 years later or whatever.
cheers
Allan