Hi Leif
thank you for sharing that information
Bad Baader filter?
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swisswalter
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Re: Bad Baader filter?
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE 
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Merlin66
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Re: Bad Baader filter?
Lief,
Exactly which filter are you testing?
I can replicate the test with my spectroscope....
Exactly which filter are you testing?
I can replicate the test with my spectroscope....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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markthais
Re: Bad Baader filter?
Like Merlin66 said, which filter is it. If it is a BG glass filter you will find that they turn back on(in the orange or red) depending on which one it is. If it is a bandpass filter then it should not be doing that.
Mark W.
Mark W.
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sullij1
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Re: Bad Baader filter?
Yes, that is the Baader BG25 equivalent. Here ia another at CN for sale more clearly labeled.
http://www.cloudynights.com/classifieds ... all&page=5
http://www.cloudynights.com/classifieds ... all&page=5
Look Up!
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Merlin66
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Re: Bad Baader filter?
The reason I asked, is that I have a set of 4 Baader CCD filters (#2458350) and it came complete with a set of transmission curves.
The BLUE (Zartblau) (80a) shows a 87% transmission at 380nm and drops off quickly at 500nm through to around 670nm.
The GREEN (hellgrun) gives 78% at 540nm but only drops to 40% by 700nm.....
I'll put them in the spectroscope at the first opportunity....
(I think the filter you're looking at is this one..
http://www.teleskop-express.de/shop/pro ... lblau.html )
The BLUE (Zartblau) (80a) shows a 87% transmission at 380nm and drops off quickly at 500nm through to around 670nm.
The GREEN (hellgrun) gives 78% at 540nm but only drops to 40% by 700nm.....
I'll put them in the spectroscope at the first opportunity....
(I think the filter you're looking at is this one..
http://www.teleskop-express.de/shop/pro ... lblau.html )
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer