The new telephoto zoom has the same build quality of the rest of Sony's G lenses, which occupy the midrange between consumer and its pro-focused G Master line.
One of the differences between pro and consumer telephoto zooms is whether the zoom happens internally or whether the lens extends. That and maximum aperture, of course.
Though it's designed to pair with an A7 series camera, the new lens will work fine on an APS-C model, providing an effective angle of view equivalent to 75mm.
