Sony has recently become aware that some of their SEL50F14Z Planar T* FE 50mm F1.4 ZA lenses have been found to have instances of fogging inside the lens.

SEL50F14Z

Sony is offering free of charge repairs for the affected lenses until October 31, 2019

You can read further details on this recall and check if your lens is one of those affected by visiting the following link:

https://sony-paa-pa-en-web–paa.custhelp.com/app/answers/detail/a_id/173324