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Create smooth, aesthetically pleasing out-of-focus backgrounds that make sharp-focus subjects stand out more vividly with the Sony SAL-135F28 special purpose lens. A unique telephoto lens for smooth, natural focus effects in foreground and background.
The Sony 135mm f/2.8 Smooth Transition Focus lens is a manual focus prime lens that uses Smooth Trans Focus (STF) technology for a very unique effect on defocused light sources, changing the way defocused areas appear depending on how it is adjusted. With a maximum aperture of f/2.8 and minimum of f/31, this lens' high speed means you can capture images in darker conditions using faster shutter speeds and lower ISO sensitivity Smooth Trans Focus (STF) employs a special apodization element that controls the parts of the image that are not in focus. This does not affect the focused part of the image, only what is out of focus, and is set independently from the camera's focus and aperture via the STF ring. Due to the unique characteristics of the STF technology, focusing with this lens is achieved manually rather than using the camera's auto focus system. The 9 circular aperture blades of this lens aid in producing smooth backgrounds. Because the aperture blades form a near circle at the wide openings used for low light shots, spot light sources have a pleasing circular defocused effect. It has a minimum focusing distance of 2.9 feet and a front end filter diameter of 72mm. For Alpha and Minolta Maxxum DSLRs Black No image stabilization, no autofocus, no tripod collar Electronic components Model: SAL135F28 Included items: Front and rear lens cap, lens hood Dimensions: 3.90 inches high x 3.15 inches deep Weight: 1.61 pounds "
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