Complex sentence: For Nikon D40, Nikon D40x, and Nikon D60 owners, this lens is significant because it is the only available 50mm 1.4 lens with a compatible autofocus system, as of December 2008.
Split into simpler sentences: For Nikon D40, Nikon D40x, and Nikon D60 owners, this lens is significant. It is the only available 50mm 1.4 lens with a compatible autofocus system, as of December 2008.