On the same day that Nikon announced the Z series mirrorless cameras they also announced their newest lens utilizing "phase fresnel" technology. It is a 500mm f5.6 prime lens that is roughly the size of a 70-200mm f2.8, It is just over 9 inches long(237mm) and weighs 3.25lbs(1.5kg). Compare to the current smallest option for native 500mm(i.e.no TC), the 200-500mm, which is about 15 inches long and weighs in at five pounds(2.3kg). The price is listed at about three times more than the 200-500mm and about 1/3 the price of the 500mm f4. If it comes anywhere close to matching the advertised MTF charts it will be incredible.