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