This is Michael’s 24-70mm f/2.8 Sigma lens for Nikon. In addition to having nine straight aperture blades that yield wonderful sunstars, it is well built, and optically excellent.

This is Michael's 24-70mm f/2.8 Sigma lens for Nikon. In addition to having nine straight aperture blades that yield wonderful sunstars, it is well built, and optically excellent.

This is Michael’s 24-70mm f/2.8 Sigma lens for Nikon. In addition to having nine straight aperture blades that yield wonderful sunstars, it is well built, and optically excellent.