Overview

The Sigma Telemax YS 135mm f/2.8 is an inexpensive manual-focus lens with a unique macro ring that allows bokeh control by adjusting spherical aberration, producing a glowing effect in sharp areas. Its optical quality is otherwise unremarkable, and focusing with the glow effect is challenging, often resulting in unsharp images. Build includes a YS interchangeable mount and separate macro focusing ring for 1:5 to 1:3. It suits photographers seeking creative bokeh manipulation on a budget, but not for general sharpness.