Hello,
I've just found on my HD these two measurements we made a few years ago with an Ocean Optics HR4000 spectrometer.
The first one is about "Lunt Ca K BF". If fact, I think it was not the BF but rather the large diameter filter at the entrance of the tube attached to the diagonal. It looks like a 12 nm filter:
http://astrosurf.com/viladrich/astro/in ... ker-FJ.jpg
The second is about an old Coronado BF 10 (US made). It looks rather large, about 12 A FWHM :
http://astrosurf.com/viladrich/astro/in ... -US-FJ.jpg
A more recent Coronado BF seems to be about 7 A FWHM. This one was measured at a larger spectral resolution with Sol'Ex spectrometer :
http://astrosurf.com/viladrich/astro/in ... an2022.jpg
The measurements of other various filters (including Deep-Sky filters and some sunglasses) are available here :
http://astrosurf.com/viladrich/astro/in ... lters.html
Clear skies
Measurements of Lunt Ca K BF and Coronado BF
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Measurements of Lunt Ca K BF and Coronado BF
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/