ZWO Narrowband Filter

This filter is designed to isolate the 672nm wavelength emitted by ionized sulfur. It is essential for astrophotographers looking to capture detailed images of emission nebulae and supernova remnants.

Yes. By narrowing the bandpass to 7nm, the filter effectively blocks most artificial light and skyglow, allowing you to capture high-contrast images of deep-sky objects even from suburban environments.

This is a 36mm unmounted, drop-in filter. It is designed to fit into standard 36mm filter wheels, but you should verify that your specific wheel supports unmounted 36mm round filters.

A 7nm bandpass provides a precise balance between signal-to-noise ratio and light transmission. It is narrow enough to suppress unwanted light pollution while remaining wide enough to allow sufficient light through for shorter exposure times.

Yes. This SII filter is typically used alongside H-alpha and OIII filters to create the popular SHO tricolor palette. You will need all three to map the different gas emissions to the red, green, and blue channels.

The filter is fine-optically polished to 1/4 wave accuracy, which ensures minimal distortion and sharp star profiles. This high level of precision prevents unwanted artifacts or softening that can occur with lower-quality glass.