Bright wide aperture portrait lens fixed focal length design offers high quality optical performance dt lens design optimised for cameras with aps c sensor light compact and easy to carry smooth autofocus motor sam for smooth af operation 18 50mm fixed focal length lens f18 smooth autofocus motor sam for smooth af 35mm equivalent 75mm aperture range f18 22 for dt alpha minolta dslrs optimized for aps c image sensors smooth autofocus motor sam