Optics: 3 XA, 1 Aspherical, 2 Super ED, 3 ED Elements. Fluorine and Nano AR Coating.
Focusing: Of course. All internal. 4 XD Linear motors
Minimum Focusing Distance: 28cm
*Fastest to have a wider wide at the ultra wide zoom so, yes, there is a Sigma 14-24mm f/2.8 ART and a Laowa 12mm f/2.8 but this Sony does it faster and wider and does the zoomy bit but that doesn't fit in a title.