Celestron Oxygen III Narrowband Filter - 2"

The Celestron 2" Oxygen III Narrowband Filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light

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Picstop.co.uk
Celestron Oxygen III Narrowband Filter - 2"
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£ 115.99
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