I usually don't notice Fred posting this information, and virtually all review sites cannot be trusted for their vignetting data since they measure it from OOC JPEGs with contrast curves rather than from linear raw data. Also, no one posts information about the "inner corners" of the lenses, which are important where they overlap if doing stitching for astrophotography. For a single row stitch, I overlap frames by 50%, and the long edge of the sensor is orientated perpendicular to the long edge of the final stitched image. If doing a multi-row stitch, I overlap the frames 50% both on the long edge and short edge. Here are the three sets of vignetting data for those interested. I'm not allowed to post images so the table format is a little wonky, my apologies.
And some notes on the capture process: camera on tripod, pitched roughly 30 degrees up towards heavily overcast sky. Raw uncompressed. ISO 100. Single-shot mode. IBIS off. LENR off. Lens Comp, all off. Lens focused at infinity in Live View using manual focus on distant subject. Using my sanded-to-matte translucent white acrylic "diffuser" filter, 4mm thick. Ensure shutter speed slow enough that falloff pattern is centered in frame. EFCS off, full mechanical shutter used.
Readouts taken from RawTherapee 'save for reference' with no white balance exported TIFFs, linear raw values from G channel. Used Photoshop colour picker 11x11 sampling, 4 sample points averaged for corners, used ruler guides to ensure exact sampling spot across frames
Extreme Corner read out at 50 pixels from image edge.
Single-row stitch corners 50% overlap coordinates in sensor dimensions, origin is top left image corner, are (0,6)(36,6)(0,18)(36,18) in millimetres
Multi-row stitch corners 50% overlap coordinates in sensor dimensions, origin is top left image corner, are (9,6)(27,6)(9,18)(27,18) in millimetres
