SV165 Six-point guide ring.The six-point fixed method with adjustable angle can adjust the coaxiality between the guide mirror and the main telescope according to the needs; the six screws are equipped with nuts to ensure that the screws will not loosen during use.SV223 Diagonal mirror redirect the light path inside a telescope, so that an easier viewing position is possible.The SV550 122mm telescope adopts a FPL-51 triplet apochromatic lens structure which contains one piece of ED glass. The triplet lens provides better correction of aberration and significantly reduces chromatic aberration and enhance the clarity and sharpness.