Dual Narrowband Astronomical Filters are used for:
Deep-sky Imaging: Isolate specific emission lines (e.g., Ha at 656nm and OIII at 500.7nm) to capture detailed structures of emission nebulae and planetary nebulae.
Light Pollution Reduction: Block unwanted light, enhancing visibility of faint celestial objects in urban areas.
Improved Contrast: Make dark regions of nebulae and galaxies stand out.
Long-exposure Photography: Allow extended exposure without overwhelming noise.
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