Linienfilter lassen ganz selektiv nur das Licht einer bestimmten Spektrallinie durch. Besonders beliebt sind OIII-, SII- und H-Alpha-Filter.
Die römischen Zahlen III und II bezeichnen dabei den Ionisationsgrad des chemischen Elements, das die Spektrallinie erzeugt. So steht OIII (sprich: "Oh drei") für zweifach ionisierten Sauerstoff und SII für einfach ionisierten Schwefel. OI und SI bezeichnen die elektrisch neutralen Atome.
Linienfilter sind ideal zur visuellen Beobachtung und Fotografie von Emissionsnebeln, Supernova-Überresten und planetarischen Nebeln, da diese Objekte definierte Spektrallinien erzeugen. Sternhaufen und Galaxien hingegen haben ein kontinuierliches Spektrum. Für sie sind Filter zur allgemeinen Unterdrückung der Himmelsaufhellung besser geeignet (CLS- oder UHC-Filter).
![Beispiel eines Emissionslinienspektrums (Quelle: Wikipedia)](/CMS/images/text/glossary/Emissionslinien_Wikipedia.png)
![Omegon Pro OIII CCD Filter 1,25''](/Produktbilder/normal/47292_1/Omegon-Pro-OIII-CCD-Filter-1-25-.jpg)
Omegon
Pro OIII CCD Filter 1,25''
$ 139,-
![Omegon Pro OIII CCD Filter 2''](/Produktbilder/normal/47293_1/Omegon-Pro-OIII-CCD-Filter-2-.jpg)
Omegon
Pro OIII CCD Filter 2''
$ 179,-
![Omegon Pro SII CCD Filter 2''](/Produktbilder/normal/47295_1/Omegon-Pro-SII-CCD-Filter-2-.jpg)
Omegon
Pro SII CCD Filter 2''
$ 189,-
![Omegon OIII Filter 1,25"](/Produktbilder/normal/15625_1/Omegon-OIII-Filter-1-25-.jpg)
Omegon
OIII Filter 1,25"
$ 89,-
![Baader Filter OIII CMOS Narrowband 65x65mm](/Produktbilder/normal/70864_1/Baader-Filter-OIII-CMOS-Narrowband-65x65mm.jpg)
Baader
Filter OIII CMOS Narrowband 65x65mm
$ 381,-
![Baader Filter OIII CMOS f/2 Highspeed 36mm](/Produktbilder/normal/70916_1/Baader-Filter-OIII-CMOS-f-2-Highspeed-36mm.jpg)
Baader
Filter OIII CMOS f/2 Highspeed 36mm
$ 186,-
![Baader Filter OIII CMOS f/2 Ultra-Highspeed 36mm](/Produktbilder/normal/70937_1/Baader-Filter-OIII-CMOS-f-2-Ultra-Highspeed-36mm.jpg)
Baader
Filter OIII CMOS f/2 Ultra-Highspeed 36mm
$ 340,-
![Baader Filter OIII CMOS f/2 Ultra-Highspeed 50,4mm](/Produktbilder/normal/70939_1/Baader-Filter-OIII-CMOS-f-2-Ultra-Highspeed-50-4mm.jpg)
Baader
Filter OIII CMOS f/2 Ultra-Highspeed 50,4mm
$ 415,-
![Baader Filter OIII CMOS f/2 Ultra-Highspeed 50x50mm](/Produktbilder/normal/70940_1/Baader-Filter-OIII-CMOS-f-2-Ultra-Highspeed-50x50mm.jpg)
Baader
Filter OIII CMOS f/2 Ultra-Highspeed 50x50mm
$ 428,-
![Baader Filter H-alpha CMOS Narrowband 65x65mm](/Produktbilder/normal/70857_1/Baader-Filter-H-alpha-CMOS-Narrowband-65x65mm.jpg)
Baader
Filter H-alpha CMOS Narrowband 65x65mm
$ 386,-
![Baader Filter H-alpha CMOS Ultra-Narrowband 50,4mm](/Produktbilder/normal/70876_1/Baader-Filter-H-alpha-CMOS-Ultra-Narrowband-50-4mm.jpg)
Baader
Filter H-alpha CMOS Ultra-Narrowband 50,4mm
$ 445,-
![Baader Filter H-alpha CMOS f/2 Highspeed 31mm](/Produktbilder/normal/70908_1/Baader-Filter-H-alpha-CMOS-f-2-Highspeed-31mm.jpg)
Baader
Filter H-alpha CMOS f/2 Highspeed 31mm
$ 166,-
![Baader Filter H-alpha CMOS f/2 Highspeed 36mm](/Produktbilder/normal/70909_1/Baader-Filter-H-alpha-CMOS-f-2-Highspeed-36mm.jpg)
Baader
Filter H-alpha CMOS f/2 Highspeed 36mm
$ 188,-
![Baader Filter H-alpha CMOS f/2 Highspeed 50x50mm](/Produktbilder/normal/70912_1/Baader-Filter-H-alpha-CMOS-f-2-Highspeed-50x50mm.jpg)
Baader
Filter H-alpha CMOS f/2 Highspeed 50x50mm
$ 316,-
![Baader Filter H-alpha CMOS f/2 Highspeed 65x65mm](/Produktbilder/normal/70913_1/Baader-Filter-H-alpha-CMOS-f-2-Highspeed-65x65mm.jpg)
Baader
Filter H-alpha CMOS f/2 Highspeed 65x65mm
$ 391,-
![Baader Filter H-alpha CMOS f/2 Ultra-Highspeed 31mm](/Produktbilder/normal/70929_1/Baader-Filter-H-alpha-CMOS-f-2-Ultra-Highspeed-31mm.jpg)
Baader
Filter H-alpha CMOS f/2 Ultra-Highspeed 31mm
$ 306,-
![Baader Filter H-alpha CMOS f/2 Ultra-Highspeed 36mm](/Produktbilder/normal/70930_1/Baader-Filter-H-alpha-CMOS-f-2-Ultra-Highspeed-36mm.jpg)
Baader
Filter H-alpha CMOS f/2 Ultra-Highspeed 36mm
$ 370,-
![Baader Filter SII CMOS Ultra-Narrowband 31mm](/Produktbilder/normal/70887_1/Baader-Filter-SII-CMOS-Ultra-Narrowband-31mm.jpg)
Baader
Filter SII CMOS Ultra-Narrowband 31mm
$ 285,-
![Baader Filter SII CMOS f/2 Highspeed 1,25"](/Produktbilder/normal/70921_1/Baader-Filter-SII-CMOS-f-2-Highspeed-1-25-.jpg)
Baader
Filter SII CMOS f/2 Highspeed 1,25"
$ 158,-
![Baader Filter SII CMOS f/2 Ultra-Highspeed 36mm](/Produktbilder/normal/70944_1/Baader-Filter-SII-CMOS-f-2-Ultra-Highspeed-36mm.jpg)
Baader
Filter SII CMOS f/2 Ultra-Highspeed 36mm
$ 346,-
![Baader Filter SII CMOS f/2 Ultra-Highspeed 2"](/Produktbilder/normal/70945_1/Baader-Filter-SII-CMOS-f-2-Ultra-Highspeed-2-.jpg)
Baader
Filter SII CMOS f/2 Ultra-Highspeed 2"
$ 396,-
![Baader Filter SII CMOS f/2 Ultra-Highspeed 50x50mm](/Produktbilder/normal/70947_1/Baader-Filter-SII-CMOS-f-2-Ultra-Highspeed-50x50mm.jpg)
Baader
Filter SII CMOS f/2 Ultra-Highspeed 50x50mm
$ 428,-
![Baader Filter H-alpha/OIII/SII CMOS f/2 Highspeed 31mm](/Produktbilder/normal/70950_1/Baader-Filter-H-alpha-OIII-SII-CMOS-f-2-Highspeed-31mm.jpg)
Baader
Filter H-alpha/OIII/SII CMOS f/2 Highspeed 31mm
$ 477,-
![Omegon Pro H-Alpha 7nm Filter 1,25"](/Produktbilder/normal/60111_1/Omegon-Pro-H-Alpha-7nm-Filter-1-25-.jpg)
Omegon
Pro H-Alpha 7nm Filter 1,25"
$ 199,-
![Omegon Pro SII CCD Filter 1,25''](/Produktbilder/normal/47294_1/Omegon-Pro-SII-CCD-Filter-1-25-.jpg)
Omegon
Pro SII CCD Filter 1,25''
$ 139,-
![Omegon UHC Filter 2"](/Produktbilder/normal/15628_1/Omegon-UHC-Filter-2-.jpg)
Omegon
UHC Filter 2"
$ 99,-
![Omegon OIII Filter 2"](/Produktbilder/normal/15627_1/Omegon-OIII-Filter-2-.jpg)
Omegon
OIII Filter 2"
$ 119,-
![Omegon Pro H-Alpha Filter 1,25''](/Produktbilder/normal/47298_1/Omegon-Pro-H-Alpha-Filter-1-25-.jpg)
Omegon
Pro H-Alpha Filter 1,25''
$ 149,-
![Omegon Pro H-Alpha Filter 2''](/Produktbilder/normal/47299_1/Omegon-Pro-H-Alpha-Filter-2-.jpg)
Omegon
Pro H-Alpha Filter 2''
$ 209,-
![Omegon Pro H-Beta Filter 1,25''](/Produktbilder/normal/47300_1/Omegon-Pro-H-Beta-Filter-1-25-.jpg)
Omegon
Pro H-Beta Filter 1,25''
$ 99,-
![Omegon Pro H-Beta Filter 2''](/Produktbilder/normal/47301_1/Omegon-Pro-H-Beta-Filter-2-.jpg)
Omegon
Pro H-Beta Filter 2''
$ 139,-
![Coronado Filter SolarMax III H-Alpha-Etalon 60mm BF10](/Produktbilder/normal/59478_2/Coronado-Filter-SolarMax-III-H-Alpha-Etalon-60mm-BF10.jpg)
Coronado
Filter SolarMax III H-Alpha-Etalon 60mm BF10
$ 2.460,-
![Coronado Filter SolarMax III H-Alpha-Etalon 90mm BF30](/Produktbilder/normal/59473_1/Coronado-Filter-SolarMax-III-H-Alpha-Etalon-90mm-BF30.jpg)
Coronado
Filter SolarMax III H-Alpha-Etalon 90mm BF30
$ 7.100,-
![Coronado Filter SolarMax III H-Alpha-Etalon 60mm BF15](/Produktbilder/normal/59478_2/Coronado-Filter-SolarMax-III-H-Alpha-Etalon-60mm-BF15.jpg)
Coronado
Filter SolarMax III H-Alpha-Etalon 60mm BF15
$ 2.670,-
![Coronado Filter SolarMax III H-Alpha-Etalon 60mm BF30](/Produktbilder/normal/59478_1/Coronado-Filter-SolarMax-III-H-Alpha-Etalon-60mm-BF30.jpg)
Coronado
Filter SolarMax III H-Alpha-Etalon 60mm BF30
$ 4.060,-
![Lumicon H-Beta Filter 1,25"](/Produktbilder/normal/6747_4/Lumicon-H-Beta-Filter-1-25-.jpg)