Sony SAL-135F28 135mm f/2.8 (T4.5) STF Telephoto Lens for Sony Alpha Digital SLR Camera

Smooth Transmission Focus: While subjects remain in sharp focus, out-of-focus backgrounds or foregrounds are blurred smoothly and evenly with gradation that thickens toward the edges ofthe frame for a pleasing aesthetic effect. Transmissive Brightness: After light passes through the apodization element, the lens aperture of f2.8 yields a T (transmissive brightness) equivalent of 4.5; a manual aperture ring can adjust T setting from 4.5 to 6.7. Wide Focus Ring: The dedicated manual focusing system is controlled by a wide focus ring that’s comfortable to hold and gives you a solid, hands-on feel for pinpoint focusing of your subject. Circular Aperture: Because aperture blades form a near circle at the wide openings used for low-light shots, spot-light sources have a pleasing circular defocused effect.

Smooth transmission focus system for pleasing effect
Apodization lens element smooths out-of-focus areas
Subjects stand out vividly against smooth, even backgrounds
Manual aperture ring adjusts from T 4.5 to T 6.7, manual focusing with comfortable wide focus ring
Circular aperture gives spot light sources a circular shape