Overview

The Sigma-XQ MF 135mm f/2.8 MC is a manual-focus prime lens for 35mm SLRs, produced from 1977-1978. It has a 4-element/4-group design. User ratings on allphotolenses.com give it high marks for mechanical quality (4.5/5) and good optical quality (4.0/5), bokeh (4.0/5), and value (4.0/5). Its overall rating is 4.1/5. The lens suits photographers who appreciate vintage manual-focus lenses and value solid build and decent optics, though specific weaknesses are not noted in the excerpts.