ZWO 1.25" SII 7nm Narrowband Filter - SII7nm125 Sky-Watcher Accessories Aperture: 50 mm (1

Aperture: 50 mm (1

75 - M54x0

Adjustable

Includes metal thread-on caps and back focus spacer

40 mm eyepiece included (51x)

ZWO 1.25" SII 7nm Narrowband Filter - SII7nm125 Sky-Watcher Accessories Aperture: 50 mm (1The 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 1. 25" threaded metal cell and can be used in 1. 25"