The Tamron 200-500mm F5.0-6.3 SP AF Di LD (IF) Lens is a powerful zoom for capturing close, detailed views of faraway subjects, this high-magnification beauty is the perfect choice for nature and sports shooters. Remarkably light and compact, it compresses the apparent distance between objects within the frame, giving stunning pictorial effects. Even while covering up to a 500mm that enables you to take ultra telephoto shots of subjects further than the eye can see, its design is extremely lightweight and compact weighing a mere 43.6 ounces. When mounted on an APS-C size digital SLR camera, it provides a focal length equivalent to a 760mm for super ultra telephoto imaging. The lens features Tamron's Di (Digitally Integrated Design) optical system to meet the performance characteristics of digital SLR cameras as well as film cameras.The 200-500mm features two LD elements that provide sharp and clear images. Tamron's SP (Super Performance) Lens design is incorporated into the 200-500mm lens. The optical system was also designed to provide outstanding image quality with high contrast. This design feature allows the 200-500mm lens to provide outstanding images that are uniform and sharp over the entire field. The IF (Internal Focusing) system means that the lens does not change physical size while focusing. The detachable FEC (Filter Effect Control) is designed to rotate the filter to the desired position with the hood attached. This enables you to simultaneously perform minute adjustments to the PL filter compensation. The tripod mount is detachable in one simple touch and is made of a magnesium alloy. This makes for a light-weight but rigid accessory which also results in enhanced balance and ease of use in hand-held shooting.
This is the magnifying factor of a lens. Macro lenses will often be described by their “magnification factor”. A lens with a 1:1 magnification factor produces a projected image on the sensor which is the same as the subject.
The individual pieces of glass that form the overall optical construction. Most lenses have between four and eleven elements to bend the light rays to ensure a perfectly formed image appears on the light sensitive surface, such as a film or CCD. The elements are arranged in groups and may be seen in specification sheets as, for example, 6 elements in 4 groups. That configuration may have two single elements and the other four grouped in pairs.