Sony DSLR-A300K/N Lenses and Accessories Selection Guide - Page 11

Carl Zeiss® Lenses Unparalleled quality has long been the hallmark of Carl Zeiss lenses. And now, over 160 years of optical expertise has been distilled into a series of mount lenses, jointly developed by Carl Zeiss and Sony. With exclusive T* ("T-star") coating technology for higher light transmission, and minimal flare and ghosting. With marvelously faithful and luminous colors. And with extreme compensation of various optical aberrations. Discover some of the world's finest lenses, and unlock your true artistic potential. 20 Carl Zeiss Lenses SAL85F14Z (Planar T* 85mm F1.4 ZA) Modulation Transfer Function (MTF) SAL85F14Z Aspherical lens Planar T* 85mm F1.4 ZA • Lens groups/elements: 7/8 • Minimum focus: 33-1/2" (0.85 m) • Filter diameter: 72 mm • Size: (diameter x length): 3-3/16 x 2-15/16" (81 x 75 mm) • Weight: 1 lb 6.6 oz (640 g) Among the finest choices for portrait photography. The Carl Zeiss Planar T* lens for digital SLRs is a new-generation model that allows gorgeous portraits to be captured at a relaxed distance from the subject, while providing superior image clarity and also smooth, natural defocusing that adds depth to your portraits. Optimum handling is ensured by features such as a focus hold button to lock focus and a focus ring that does not rotate during AF operation. With its large aperture, the SAL85F14ZA is ideal for handheld shooting in low light, especially when used in conjunction with Super SteadyShot, the in-camera image stabilization system of the digital SLR. MTF is a measurement of how well a lens can reproduce fine details at a high level of contrast. The curves below show lens performance at two levels of spatial frequency (10 or 30 line pairs/mm) for two types of targets (radial R, tangential T). Performance is measured at two settings: open and F8. For each condition, contrast level changes at various points away from the center of the image. Contrast (%) Contrast (%) MTF Open 100 80 60 40 20 MTF F8 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) R10 line pairs/mm T10 line pairs/mm R20 line pairs/mm T20 line pairs/mm For details of MTF, please refer to p17. (R: radial target, T: tangential target) R40 line pairs/mm T40 line pairs/mm Icons: Circular aperture Internal focusing Focus Hold Button Focus Range limiter ADI flash metering SSM (Super sonic wave motor) • For details, please refer to the Lens Technology section on p.26-28. 21