The Schneider-Kreuznach Apo Symmar L 5.6/210 will cover 8x10 with a little wiggle room for movements. See the image circle chart on page 12 of this PDF:
http://www.rodklukas.com/resources/Schneider_large-format-lenses.pdf
http://www.rodklukas.com/resources/Schneider_large-format-lenses.pdf
