Asobinet found a patent for the APS-C Tamron 18-50mm f/3.5-5.6 which should be a compact zoom for X and E Mount. Example 1 Focal length: 18.528-49.967 F value: 3.605-5.308 Half angle of view: 39.012-15.652 Image height: 14.250 Overall length: 97.833-119.002 Back focus: 37.320 via asobinet, SonyAddict
