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Tamron's new 70-210mm F/4 Di VC USD (Model A034) is a compact telephoto zoom lens for fullframe DSLRs that achieves superb optical performance with high contrast and resolutionthroughout the entire zoom range. Model A034 features a constant maximum aperture of F/4, providing superior control over depth-of-field and excellent bokeh. Compared to large aperture telephoto zoom lenses, the new A034 is lighter (just 30.3 oz.) and is more compact (only 6.8 in.) making it easier to carry and instantly spring into action. The lens boasts the highest-in-class maximum magnification ratio of 1:3.1 and the shortest-in-class MOD of 37.4". The shorter working distance enables photographers to capture close-up images of small objects like flowers while using a telephoto zoom. With its highly reliable internal zoom mechanism, the physical length of the lens does not change during zooming, thereby minimizing changes in the center of gravity and providing more stable use and operation. So-called "zoom creep" is impossible because the overall length never extends. This design provides a very robust and sturdy feeling, and the non-rotating front element makes the use of polarizing filters much easier. PRODUCT HIGHLIGHTS 1. High-performance telephoto zoom lens with a constant maximum aperture of F/4 Leveraging Tamron's years of knowhow developing telephoto zoom lenses, Model A034 achieves superb optical performance with high contrast and resolution. The optical construction (20 elements in 14 groups) uses three LD (Low Dispersion) lens elements to effectively compensate for axial and transverse chromatic aberrations, thereby ensuring crisp and crystal-clear image quality across the entire frame. Furthermore, Model A034 features a constant maximum aperture of F/4 throughout the entire zoom range, thus providing superior control over depth-of-field and excellent bokeh. Compared to large aperture telephoto zoom lenses, the new A034 is lighter with a weight of just 30.3 oz. and is more compact with a total length of only 6.8 in. for excellent portability. The lighter weight and smaller size make this new lens easier to carry and instantly spring into action. 2. Class-leading magnification ratio and MOD (Minimum Object Distance) Model A034 boasts the highest-in-class maximum magnification ratio of 1:3.1 and the shortest-in-class* MOD of 37.4 in. The shorter working distance enables photographers to capture close-up images of small objects like flowers while using a telephoto zoom. *Among 70-200mm F/4 class interchangeable lenses for full-frame DSLR cameras (as of January 2018: Tamron) 3. Highly reliable internal zoom mechanism Thanks to an internal zoom mechanism, the physical length of the A034 does not change during zooming, thereby minimizing changes in the center of gravity and providing more stable use and operation. In addition, it's not necessary for the photographer to move backwards even when shooting space is limited, for instance, when...

The Micro Four Thirds Camera Lens Turbo Adapter from Mitakon allows lenses to bemounted to Micro Four Thirds format cameras, increasing the angle of view by 0.726x and the maximum aperture of the lens by 1 f-stop. The four optical elements of the Lens Turbo adapter condense light from the fullframe lens and project it onto the camera's sensor allowing the sensor to capture all of the transmitted light, negating the crop factor and effectively producing full-frame coverage on non-full-frame sensors. A corresponding increase in the maximum aperture of 1 f-stop makes the lens more effective in low-light situations. This adapter features 4 optical elements including one extra-low dispersion (ED)element which reduces aberrations for better delineated images. The adapter offers a sturdy metal construction and stainless steel mounts, it attaches to both camera and lens with little play and includes a front and rear protective cap. The Lens Turbo is a manual adapter offering no electronic communication between lens and camera. NOTE:This lens turbo adaptor may not fit all lenses due to different extensions at the lens rear mount. Lenses with extension more than 3mm are not recommended to use this lens turbo adaptor.