The Sony E 70-350mm f/4.5-6.3 G OSS is an APS-C lens and is not specifically designed for full-frame cameras such as the Sony Alpha 7 IV. However, it is technically possible to use APS-C lenses on a full-frame camera by activating the APS-C mode. This reduces the resolution as only part of the sensor is utilised. One disadvantage is that the full resolution of the camera is not utilised and the image quality could be impaired in comparison to a full-frame lens. In addition, APS-C lenses that are not designed for full-frame format could cause vignetting if they are used without APS-C mode.