Sony STF 135mm F/2.8 (T4.5) Softfocus Lens - Smooth Trans Focus Lens For Sony A Mount Cameras: A77, A77ii, A99, A99ii Can also be adapted to Sony E Mount Cameras such as A1, A7, A9, etc. Lens is in Excellent+ condition with almost no signs of use, except for some faint marks on the plastic hood. The glass is pristine, with no scratches, dust, marks, fungus, separation, or other defects. PLEASE SEE THE PHOTOS FOR CONDITION, AND ALSO PHOTOS TAKEN WITH THIS EXACT LENS TO DEMONSTRATE THE SHARPNESS AND BEAUTIFUL BOKEH THIS LENS CAN PRODUCE. THE PHOTOS WERE TAKEN WITH A SONY A7iv WITH AN LA-EA5 ADAPTER. Works with every Sony A Mount digital camera body ever made, such as Sony A99, A99ii, A77, A77ii, A55, A58, A65, and all other variants. Also fits Minolta A Mount film camera such as Minolta/Dynax/Maxxum/?-9. Can also be adapted for use on E Mount cameras such as Full Frame A7, A7r, A7s, A1, FX camcorders, APS-C NEX, Alpha 3000-6000 series, PXW camcorders, and all of their variants, by using Sony adapters LA-EA3, LA-EA4, or LA-EA5. INCLUDES: - Sony STF 135mm F/2.8 Smooth Trans Focus Lens - Lens Hood - Front Lens Cap - Rear Lens Cap PRODUCT DESCRIPTION The Sony STF 135 mm is a unique lens that was specially designed to deliver smooth transitions between crisp in-focus areas and creamily defocused background and foreground areas. This buttery smooth bokeh is achieved through the use of Smooth Trans Focus technology, which uses apodization optics in order to diffuse the edges of out-of-focus elements, and a circular aperture, rendering them even smoother than a standard lens can produce with a pleasing Circular defocused effect. So this is by no means a soft-focus lens - on the contrary, the reproduction of details in the focused plane is as crisp and sharp as that of few other lenses. The f/2.8 maximum aperture assists in capture images with shallow depth of field, though with the apodization elements this functions as a T4.5. The lens also features a manual focus design with a manual focus distance of 2.9'. Additionally, it features both a ten-blade manual aperture diaphragm and a nine-blade auto aperture diaphragm, both rounded to create smooth bokeh. When changing your aperture to defocus the background, the light sources appear blurred. This ?bokeh? effect of the blurred background is enhanced with circular aperture blades used in this lens. Conventional aperture blades have flat sides creating unappealing polygonal shaped defocused points of light. This STF lens overcomes this problem through a unique design that keeps the aperture almost perfectly circular from its wide-open setting to when it is closed by 2 stops. Smoother, more natural defocusing can be obtained as a result. Featuring a manual aperture ring to provide direct, hands-on defocusing control and offers smooth, natural highlight diffusion, this 135mm lens promises a one-of-a-kind photographic experience. In portraits, for example, the blurred background is resolved in a particularly beautiful way, as promised by the abbreviation STF: Smooth Trans Focus. The lens is always focused manually, so it is used without autofocus. The relevant aperture values ??can be set directly via a rotating ring on the lens. The aperture can just as well be selected from the camera as usual, the ring is then set to A. The geometric luminous intensity (F value) of the lens is 2.8. This value is relevant for the depth of field and the reproduction of the blurred areas. The apodization element used swallows almost one and a half stops of light. The amount of light effective for exposure, indicated by the T value (aperture value appropriate for transmission), effectively corresponds to an aperture of 4.5. In other words: the depth of field can be chosen as small as f/2.8, while the exposure corresponds to that of f/4.5; a manual aperture ring can adjust T setting from 4.5 to 6.7. The camera automatically takes this effect into account when metering the exposure. As an additional extra, the lens offers an extended close-up setting up to a scale of 1:4. This means that the special properties can also be used for close-ups with their typically shallow depth of field. Technical specifications: Optical construction: 8 elements, 6 groups Minimum focusing distance: 87 cm Maximum magnification: 1:4 Filter thread: 72 mm Diameter: 80mm diameter Length: 99mm long Weight: 730 gr. Note: Please make sure this fits your camera before purchasing. This lens does not fit directly on Sony E Mount cameras and requires an adapter for E Mount cameras. This is a manual focus lens, it does not have auto focus.