ZWO 2" SII 7nm Narrowband Filter - SII7NMD2 85mm Refractors All new hefty yet portable

All new hefty yet portable design

Total length（ without accessories）

7" between the 8061A carbon fiber tripod (sold separately) and the 31 or 45 Strain Wave Alt-Az mount to allow for longer refractors to be used without hitting the tripod

nitrogen-purged and rubber armored

Roof Prism design for compact size - Easy to hold

ZWO 2" SII 7nm Narrowband Filter - SII7NMD2 85mm Refractors All new hefty yet portableThe 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 rendition of the ZWO SII 7nm Filter is housed in a 2" threaded metal cell and can be used in 2" filter wheels