Sony SLT-A77VM 2011 α Lens and Lens Accessory Brochure and Specifica - Page 21

G Lenses Sony G Lenses are an exceptional breed.They inherit a distinguished pedigree from the original Minolta® lens line, with industry-leading Sony design and quality assurance technology added to push their performance to the forefront of twenty-first century photography. G Lenses impart a visual elegance to every aspect of the images they produce: extraordinary presence at in-focus areas, smoothly dissolving to luscious out-of-focus rendering that can provide a beautiful foundation for captivating photographic art.Their handling is extraordinary too, with intimate operation and response that seamlessly connect the process of taking photographs to the photographer's imagination. Contrast (%) Contrast (%) Telephoto zoom 70-200mm F2.8 G SAL70200G A mode, 1/60 sec., F11, ISO 100, Daylight white balance ED glass At 70 mm 100 80 60 40 20 At 200 mm 100 80 60 40 20 0 4 8 12 16 20 Distance from center of image (mm) 0 4 8 12 16 20 Distance from center of image (mm) Spatial frequency Max. aperture R T 10 line pairs/mm F8 aperture R T 30 line pairs/mm R: Radial values T: Tangential values Four ED glass elements effectively suppress aberration Constant F2.8 maximum aperture Outstanding sharpness and contrast throughout the zoom range SSM (Super Sonic wave Motor) for fast, quiet autofocus operation Circular aperture for attractive defocusing Focus hold and focus range switches offer precision focusing control The range from 70 to 200 millimeters is where much of the telephoto action occurs.The ability to cover that range with a constant F2.8 aperture affords some significant photographic advantages, and the outstanding clarity and contrast offered by the SAL70200G multiplies those advantages many times over. Although the large F2.8 maximum aperture does make it easier to create beautifully defocused backgrounds, there are important advantages for shooting moving subjects as well. Larger apertures-often referred to as "fast" as well as "bright"-allow you to use faster shutter speeds to achieve equivalent exposure, making it possible to capture motion that might end up as a blur with a slower lens.The SAL70200G does it all with characteristic G Lens refinement and class. • Weight (approx): 1340 g • Dimensions (Dia. x L): 87 x 196.5 mm • Max. magnification ratio: 0.21x • Tripod mount supplied 41