Very sharp. Very heavy. Manual focus only.
Here is a pro description:
The Minolta 135mm f/2.8 STF (Smooth Trans Focus) is a legendary, cult-classic portrait lens known for its incredibly smooth, creamy, and non-distracting background blur (bokeh) due to its unique twin-aperture design (f/2.8 actual aperture with a T/4.5 STF filter), offering excellent sharpness and unique image character, though it’s manual focus only and requires adapters for modern mirrorless cameras. Reviewers praise its fantastic build quality, pleasing colors, and exceptional bokeh, making it a favorite for portraits and isolating subjects despite being older technology.
I usually use my Sony LA-EA5 adapter on my A7R cameras. The lens works very well directly on my A77V.
