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Astronomik CLS filter causing light flare around bright stars. Is this a defect of the filter or am I doing something wrong? (Ignore the tree branches, it was just a test shot.) :
Astronomik CLS Clip-Filter EOS M APS-C (For Enhanced Spectrum Cameras)
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Astronomik CLS Filter
Astronomik CLS-CCD clip-on nebular filter for Sony Alpha 7 and 9 cameras