Free Express Shipping! Alpine Astronomical Baader C2 Swan-Band CMOS Filter (15nm) - OIII Parallel (2" Eyepiece) For Comet Gas Tail Observation, Passes C2 511 & 514nm Emission Lines, Blocks O III Line for Higher Contrast, Optimized for CMOS, Suitable...
Free Express Shipping! Alpine Astronomical Baader C2 Swan-Band CMOS Filter (15nm) - OIII Parallel (2" Eyepiece) For Comet Gas Tail Observation, Passes C2 511 & 514nm Emission Lines, Blocks O III Line for Higher Contrast, Optimized for CMOS, Suitable...