ZWO 36 mm SII 7nm Narrowband Filter - SII7NMD36

The ZWO SII 7nm Narrowband Filter passes light at the 672nm wavelength with a bandpass of 7nm for nebula observation. It is suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants.  Use this SII (Sulfur II) with H-alpha and Oxygen III narrowband filters (SHO Set) for tricolor CCD astrophotography.

This ZWO SII 7nm Filter has a diameter of 36 mm and comes unmounted.  It can be used in 36 mm filter wheels that accept filters that are 2mm thick.

How to Use the ZWO SII 7nm 36 mm Filter...

• A Hubble look can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula)

• Narrowband imaging with SHO set (H-alpha, OIII-CCD and SII-CCD) can be done with the moon in the sky so your equipment is not sitting dormant until the next new moon.

Specifications

• Size: 36 mm Diameter

• Thickness: 2 mm

• Mounted: No, comes unmounted

• FWHM：7±0.5nm

• Fine-optically polished to ensure accurate 1/4 wavefront over the both surfaces

• About 90% transmission at SII line 672nm

• Infrared wavelength 700-1100nm cut-off

• <0.1% transmission of off-band, OD3 (Optical Density)