The lens' optical formula includes 11 elements in 9 groups, with 1 ED lens, 1 aspherical lens, and 2 high-refractive lenses. It also features nano-coating, and the aperture has nine blades.

Smaller numbers mean more light in this instance, with a logarithmic scale based on the square root of 2, a mathematical oddity dictated by the circular nature of a lens and the formula to ...