INTERFERENCE
FILTER TRANSMITTANCE
For these measures I have used one of my slit spectrograh (R=1000 configuration) for evaluate spectral transmittance of some useful filter for astronomy.
For typical applications:
http://astrosurf.com/cavadore/telescope/gallery/index_halpha.html
http://www.celestialimage.com/page129.html
http://www.robgendlerastropics.com
H-alpha
filter from Edmund Scientific
(FWHM=100 A - 24-mm diameter - cost $80)
Bleue : filter spectral transmittance (measured
peak transmittance: 60% - measured FWHM: 98 A)
Red : Messier 57 spectrum - see here
H-alpha filter from Oriel
Bleue : filter transmittance
Red : Messier 57 spectrum
[OIII] filter from Oriel
Bleue : filter transmittance
Red : Messier 57 spectrum
Filters versus typical planetary nebulae spectrum
Filters versus High Pressure Sodium lamp spectrum
Note rejection of pollution light. For HPS lamp
info, click
here.
