A:Answer Hi Longbestbu, Make sure the camera runs the latest firmware version: https://esupport.sony.com/US/p/model-home.pl?mdl=ILCE7&template_id=1®ion_id=1&tab=download#/downloadTab
For more troubleshooting steps, you may visit this page: http://docs.esupport.sony.com/dvimag/ILCE-7_ILCE-7R_guide/en/cover/level2_12.html
Please be advised that a7 is not fully compatible with SEL85F18. Refer to the link below for the details of their restrictions:
http://support.d-imaging.sony.co.jp/www/cscs/accessories/compatibility.php?area=gb&lang=en&mdl=SEL85F18&cat=3
Regards,
Vincent