Proms and Filament
Taken by jp-brahic on August 4, 2016 @ uzès ( France)
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  Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: 2016:08:05 10:05:38
 
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Details:
Proms ( Aug 04th ) Réfractor 230mm Special H-Alpha, PST MOD 0.25A°, Genika Astro , Ech : 0.14"/ Pix Seeing 6/10
Photographer's website:
http://jp-brahic.chez-alice.fr/
Comments
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Most of the Standards Etalon PST have a bandwidth between 1 and 0.9 In A°, some rare models as mine have a bandwidth below 0.3A °

JP
Posted by jp-brahic 2016-08-05 11:36:12
this is not .25 angstroms. Closer to >.75a based on the gaussive fillaments.
Posted by amplelight 2016-08-05 07:48:56
 
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