Description
THE THREE NARROWBAND FILTERS ARE PERFECT FOR PHOTOGRAPHING FAMOUS NEBULA. ALSO, THEY REDUCE THE EFFECTS OF LIGHT POLLUTION.
THE FILTERS ARE HOMOFOCAL WITH ZWO'S L-RGB FILTER SET AND THEREFORE CAN BE PERFECTLY COMBINED.
H-ALPHA FILTER: THIS NARROW-BAND NEBULAR FILTER PASSES RED LIGHT WITH A LENGTH OF 656 NANOMETERS. IT IS THE LINE IN WHICH THE HII ZONES (HYDROGEN NEBULAUSES) SHINE.
OIII FILTER: NARROWBAND NEBULAR FILTER LETS 500 NANOMETER LIGHT PASS. IT IS THE TWICE IONIZED OXYGEN LINE. OF THIS COLOR ARE THE PLANETARY NEBULAE AND THE SUPERNOVA REMAINS.
SII FILTER: THE NARROWBAND FILTER LETS THROUGH THE LIGHT OF IONIZED SULFUR ATOMS AT 672 NANOMETERS. IT IS THE LINE AT WHICH MANY PLANETARY NEBULAE, EMISSION NEBULA AND SUPERNOVA REMAINS SHINE.
THE HALF-HEIGHT WIDTH OF 7 NANOMETERS IS THE OPTIMAL CHOICE FOR Astrophotography. SIGNIFICANTLY INCREASES THE CONTRAST OF THE NEBULA.
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