Baader O-III Nebula Filter - 1.25" # FOIII-1 2458395
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![Discovery of the M31 [OIII] emission arc – ZWO ASI](https://astronomy-imaging-camera.com/wp-content/uploads/the-M31-OIII-emission-arc-scaled.jpg "Discovery of the M31 [OIII] emission arc – ZWO ASI")
Discovery of the M31 [OIII] emission arc – ZWO ASI
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Optolong Optics Co.,Ltd.
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