ZWO 7nm NARROWBAND FILTER SET Cooled Beech wood specially treated for

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ZWO 7nm NARROWBAND FILTER SET Cooled Beech wood specially treated forZWO 7nm narrowband filters enhance the contrast of emission and planetary nebulae. These peculiar nebulae emit light only in specific wavelengths (H; OIII; SII) and the narrowband filters have the property to reject all light outside these bands. The passing band or "window" of these filters is 7nm wide. Considering that the visible light spectrum is between 380nm and 740nm, a 7nm filter would block 98% of the unwanted light. As a result, the signal

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