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An ideal focal length for portraiture, the SP 85mm f/1.8 Di VC USD Lens from Tamron is a short-telephoto prime designed for full-frame Canon EF-mount DSLRs. Incorporating one Low Dispersion element and one Extra Low Dispersion element into the optical design, this lens is adept at reducing chromatic aberrations and color fringing for a high degree of clarity and color accuracy, as well as sharpness and resolution. BBAR and eBAND coatings have also been applied to minimize flare and ghosting for increased contrast when working in strong lighting conditions, and a rounded nine-blade diaphragm contributes to a pleasing bokeh quality to benefit shallow depth of field imagery. Classic in terms of focal length yet optimized for the recent breed of high-resolution DSLRs, this portrait-length prime melds a familiar perspective with contemporary performance.
Complementing the optical assets, this lens is also characterized by Vibration Compensation image stabilization, which minimizes the appearance of camera shake by up to 3.5 stops for sharper handheld shooting. Also aiding in creating sharp imagery, a robust ring-type USD autofocus motor with an optimized USD actuator is used for noticeably fast and accurate focusing performance. This focusing system also lends itself to full-time manual focus control for fine-tuned precision. A moisture-resistant physical construction enables its use in trying environments and the front element has also received a fluorine coating to guard against smudges and moisture from affecting image quality. Additionally, this lens is compatible with the optional TAP-in Console for fine-tuning focusing performance and updating the lens' firmware.
Chromatic aberration appears as magenta or green color fringing along edges and contours in images, especially against bright backgrounds. It happens, in part, when the optic fails to focus all colors of light on precisely the same point, and is more conspicuous in cameras with high resolution and high pixel densities. The SP 85mm F/1.8 uses LD (Low Dispersion) and XLD (Extra Low Dispersion) glass elements in the optical design to minimize color fringing and to achieve sharp and clear image quality with high color fidelity. In addition, by thoroughly reducing chromatic aberrations (distortion of off-axis point source) and astigmatism, subjects that appear as a distinct point source will be captured as a distinct point source even at the edges and corners of the frame.
The SP 85mm F/1.8 is designed to provide tack-sharpness of the subject for stunning clarity and flawless image quality. At the same time, Tamron’s design philosophy embraces the notion that photographers—particularly portrait photographers—use background blur, bokeh, as a creative element to concentrate emphasis on the subject. Through numerous simulations conducted for wide-ranging blur effects, such as a gentle, melting transition from the focused to the out-of-focus areas, Tamron has created a soft, natural blur effect that achieves perfect harmony with the inescapable sharpness.
The SP 85mm F/1.8 is the world’s first* lens with a fixed focal length of 85mm and a fast aperture of F/1.8 that’s equipped with the VC system. Camera movement—often too minute to be perceptible to the photographer—is the leading cause of unpleasant photographs. In addition, newer DSLR cameras with higher pixel densities are more susceptible to subtle camera shake. This technology makes it possible to take photographs handheld in dim light and to make optimal use of slower shutter speeds and increased depth-of-field without extreme increase of the camera’s sensor sensitivity (ISO equivalent). This is especially important in portraiture because lighting is often low and the photographer needs the spontaneity of not using a tripod or disruptive flash units. * Among 85mm F/1.8 interchangeable lenses for full-frame DSLR cameras as of January 2016. Data source: Tamron
