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1.Doublet air spaced design
2.Inner extinction working procedure to reduce inner reflex and astigmatism,enlarge image's sharp
3.Fully Multi coating,green coating
4.Aluminum-magnesium alloy structure         
5.Retractable Dewshield
1.Optical Aperture:90mm
2.Focal length:500mm F/5.5
3.2" 10:1 two speed crayford focuser
4.Metal mounting ring
5.2" to 1.25 connector
6.Black shockproof soft bag