Sony's unique STF bokeh prime — 100mm with Smooth Trans Focus for the smoothest possible backgrounds.
The Sony FE 100mm f/2.8 STF GM OSS launched in 2017 as one of the most unique lenses in photography — featuring an apodisation filter (STF) that creates the smoothest possible bokeh by gradually reducing light transmission toward the aperture edges.
The STF filter produces genuinely unique bokeh — out-of-focus highlights have no hard edges, creating dreamlike backgrounds impossible with conventional lenses. Sharp from f/5.6. OSS stabilisation. The GM designation ensures premium optics. Effective T-stop is approximately T5.6.
Sony FE mount with 72mm filter thread. Approximately 700g. Dust and moisture resistant. OSS stabilisation. The STF effect means effective light transmission is approximately T5.6 despite f/2.8 marking — viewfinder appears dimmer.
Available used at professional prices. The STF rendering is genuinely unique — no other Sony lens offers this. The reduced effective transmission (T5.6) limits low-light use. For portrait photographers who demand the absolute smoothest possible bokeh.