Sony 135mm f/2.8 - f/4.5 STF Smooth Transition Focus a (Alpha) Mount Digital SLR Telephoto Lens with Hood

Sony 135mm F/2.8 Features

• 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.