Until a couple years back, I thought that all Nikkor lenses were equipped with these "prongs", but at that time I bought from eBay a 50m f1.8 so-called "pancake" lens, and discovered when I unpacked it, that not only did it come with no "prongs" but that it had no threaded mounting holes or any evidence of ever having any. It made me realize just how out of date I was! It took a while for me to accept that any lenses manufactured for any Nikon bodies after the F2AS didn't need prongs, and so Nikon must have omitted them. I do know that this lens is very similar to the E series lens, and I also assume the E series lenses and cameras didn't use this old F series technology.