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Got a Sony A7R with Sony 70-200 f4 G OSS lens. In the camera settings the biggest image size option available is L:15M, but it should be 36M. Why is that? Hope that someone can help me.
It is probably because you have APS-C mode set to ON, or are using an APS-C lens.
(APS-C/Super35 mode is a cropped mode that uses a smaller area of the sensor)
Go to Quality/Image Size settings and make sure APS-C/Super35 is set to Manual - OFF,
then you should see 36M image size option