Sony 135mm f/2.8 [T4.5] STF Lens

The Sony 135mm f/2.8 [T4.5] STF is a specialized 135mm prime lens built around Sony's Smooth Trans Focus technology, engineered specifically to produce exceptionally smooth out-of-focus rendering. It covers a full-frame image circle and is available in both Sony A and Sony E mounts, making it a versatile option for shooters working across Sony's DSLR and mirrorless camera ecosystems. The lens operates at a maximum aperture of f/2.8, though the STF optical element reduces the effective transmission to T4.5 — an important distinction for photographers coming from standard telephoto primes, as exposure metering will reflect the T4.5 light transmission rather than the f/2.8 geometric aperture.

Focus is entirely manual, with no autofocus capability, which suits the lens's portrait and creative photography niche where precise, deliberate focus placement is typically preferred anyway. A 72mm filter thread accommodates standard circular filters. Weighing 730g, the lens has a solid, purposeful build that feels appropriate for a specialized telephoto prime of this focal length.

For portrait, fashion, or fine art photographers who prioritize the quality of background blur above all else, this lens occupies a genuinely unique position in the Sony ecosystem.