Refractor telescope aperture 152 mm focal length 760 mm focal ratio 15 optical systems refractor fraunhofer achromatic max useful magnification 304 x tracking without ota mount without ota tripod not included minimum useful magnification 21 finderscope 8x50 eye piece 2 eyepiece type plssl included in delivery 2x barlow lens pipe clamp led torch star diagonal 125 90 star diagonal