I've downloaded a sample RAW image from the brand new compact superzoom camera Sony DSC-RX10 Mark IV and opened in RAW Therapee 5.2.
As the camera is very new, the program doesn't know how to handle it and the result looks like this:
What do those black corners mean? Is the wide end of the lens (focal length: 8.8mm, 35mm equivalent: 24.0mm), f/5.6 unable cover the sensor and the corners need to be restored/computed from remaining pixels? It's not just a vignetting, is it?
I thought this would happen only if you attach a DX lens to an FX body etc.
Do all compact cameras with zoom lenses behave like this?
Note 1: I've found how to correct it with a lens distortion slider in RAW Therapee manually.
Note 2: It doesn't happen with RAWs taken with longer focal distances.
Sample image taken from this DPReview gallery (image 29/33). Direct file links don't work.