Can I Use a Full Frame E-Mount Lens (aka FE Lens) on a Camera with an APS-C Size Sensor?
Yes, you can use an FE lens on an E-Mount camera that has an APS-C sensor. The image in the center of the lens is automatically cropped to the APS-C size, so there are no dark corners surrounding the picture to cause vignetting.
However, when you use a non APS-C or non full-frame lens on an E-Mount camera with a full-frame sensor, the image quality suffers because you're no longer using the entire sensor. Image size is cropped to almost half of the sensor's full capacity.The focal length will be multiplied by 1.5.