This is a special preset aperture type of lens meaning it has 2 aperture rings which allows you to set the aperture to a specific setting and move the aperture smoothly (no clicking) with the other ring. This allows aperture to be infinitely adjusted depending on the DOF required. It has 16 aperture blades. Both aperture rings and focus ring work without issues.

Optics are clear with no fungas or scratches. Aperture blades has oil on them as shown but still works flawless!