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Aperture: 50 mm (1
making it a great choice for viewing nearby birds
Includes metal thread-on caps and back focus spacer
This means you'll be tracking stars and planets across the sky smoother than a jazz solo
It is recommended for imaging applications incorporating 35mm and larger CCD sensors
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"
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