ZWO 2" SII 7nm Narrowband Filter - SII7NMD2 85mm Refractors 7" between the 8061A carbon

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

Roof Prism design for compact size - Easy to hold

Permanent PEC (PPEC)

and many other celestial wonders

Applying the experience of the TeleVue Telescope Eyepiece Radian development to the 82 degree Nagler series

ZWO 2" SII 7nm Narrowband Filter - SII7NMD2 85mm Refractors 7" between the 8061A carbonThe 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