Forget coverage charts; here's photographic documentation of corner detail on a 7x17" camera.
This was a circa 2 minute exposure @f64. Ilford HP5+ dev in Tetenal Ultrafin. Korona 7x17 camera on Manfrotto 161MkII tripod.
The lens is a Graphic Kowa 240mm f9 in barrel.
Please not that I scanned the corner images through the clear neg holder (thus the lines through the image).
These scans have not been touched - direct from the scanner (thus, a bit dark).
I've included a low res copy of the whole image with reference to where the sections were taken from.
I hope that this settles, once and for all, that this lens does cover 7x17" (and, therefore, 11x14") with good sharpness in the corners.
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