Refractor telescope aperture 70 mm focal length 900 mm focal ratio 110 optical systems fraunhofer achromatic refractor suitable for beginners children max useful magnification 140 x tracking equatorial mount equatorial mount ng tripod aluminium tripod telescope feature easily transportable astrophotography function none lens barrel length 950 mm minimum useful magnification 10 series bresser junior resolution power 164 bogensekunden light col