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For the underlying theory
which isolates the 501nm OIII line and both C2 lines at 511nm and 514nm
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Tube outer diameter: 8
Lumicon 2 Inch #58 Dark Green Color Filter Tri-Bahtinov Mask For the underlying theoryLumicon 2 Inch #58 Dark Green Color Filter Lumicon 2 Inch #58 Dark Green Color Filter is ideal for searching out clouds on Venus, polar ice caps on Mars, red blue contrasts on Jupiter, and the belts and polar regions of Saturn. Fits any standard 2" eyepiece.
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