The comparison chart on the Home Page says it's 17mm. Applying the dimensional analysis that I learned in college:

50mm (35)/300mm (8x10) * 120mm (8x10) = 20mm 35mm Equiv.

Also the chart says that the Nikkor will not support a front rise. However this image taken last week was shot using front rise and a back tilt:



The above is a scan done with an Epson 3200 which will not cover the negative. But note that there is no fallout on the edges.

Thomas