Sony SLT-A77VM 2011 α Lens and Lens Accessory Brochure and Specifica - Page 13

Contrast (%) Contrast (%) Contrast (%) Contrast (%) P mode, 1/125 sec., F5.6, +0.3 EV, ISO 100, Auto white balance, Portrait Creative Style; Photo: Norifumi Inagaki High magnification zoom DT 18-250mm F3.5-6.3 SAL18250 Two ED glass elements and two aspherical elements for superior image quality Extra-broad zoom range in a compact, lightweight lens Circular aperture for attractive defocusing Internal focusing for fast autofocus and short min. focus distance 35mm equivalent focal length: 27-375mm At 18 mm 100 80 60 40 20 Aspherical lens At 250 mm 100 ED glass 80 60 40 20 0 3 6 9 12 Distance from optical center of lens (mm) 0 3 6 9 12 Distance from optical center of lens (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 Although similar to the SAL18200 in zoom range and performance, the SAL18250 offers a bit more "reach" at the long end that can make a significant difference if you're shooting sports or wildlife, for example. The tradeoff is a small increase in weight and size, but if you need the extra range the difference is worth it.You get the same outstanding clarity and contrast from the wide 18mm end to full 250mm telephoto, making this lens one of the most useful and versatile for APS-C format cameras and an extremely wide spectrum of subjects. • Weight (approx): 440 g • Dimensions (Dia. x L): 75 x 86 mm • Max. magnification ratio: 0.29x 24 A mode, 4 sec., F9.0, -1.0 EV, ISO 200, Daylight white balance; Photo: Kazu Kobayashi Mid-range zoom 28-75mm F2.8 SAM SAL2875 At 28 mm 100 80 60 40 20 Aspherical lens ED glass At 75 mm 100 80 60 40 20 0 4 8 12 16 20 Distance from optical center of lens (mm) 0 4 8 12 16 20 Distance from optical center of lens (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 Three ED glass elements and four apherical elements for superior image quality Bright constant F2.8 maximum aperture Responsive internal SAM (Smooth Autofocus Motor) autofocus drive Circular aperture for attractive defocusing * The SAL2875 received the 2010 TIPA Best Expert Lens award. If you use a 35mm full frame format camera body, this award-winning* lens offers an ideal balance of brightness, zoom range and image quality for a wide range of situations you're likely to encounter in everyday shooting.The fact that it features a constant, bright F2.8 maximum aperture at all focal lengths offers significant advantages for hand held and low light shooting, as well as for creating gorgeous defocused backgrounds. But you never know when you might need to go a bit longer, so if there's room in your bag consider taking the 75-300mm SAL75300 along as well: the SAL2875 plus SAL75300 combination gives you a full-frame focal length range from 28mm to 300mm. • Weight (approx): 565 g • Dimensions (Dia. x L): 77.5 x 94 mm • Max. magnification ratio: 0.22x 25