Refractor telescope aperture 90 mm focal length 900 mm focal ratio 110 optical systems refractor fraunhofer achromatic suitable for beginners max useful magnification 675 x tracking equatorial mount equatorial mount 3 eq3 tripod aluminium tripod telescope feature easily transportable minimum useful magnification 45 eyepiece type super plssl eyepiece focal length in mm 20 4 12 mm included in delivery 3x barlow lens moon filter