Tamron's answer to vibration compensationblur-stopping power with no annoying motion delay In your viewfinder is achieved in its all-in-one long range zoom lens, the Tamron 28-300mm f/3.5-6.3 AF XR Di VC LD Asph. (IF) Macro Zoom Lens. Camera shake can ruin your photos, particularly at telephoto or in low light situations. Tamron's state-of-the-art Vibration Compensation mechanism incorporated into this award-winning 28-300mm zoom gives you blur-free hand-held images for incredible results! Finally, the technology you need in the lens you want. The "VC" enables you to use subject movement to achieve a good effect, bringing out the contrast between motion and stillness. You can also shoot with out a flash to evoke the "real" atmosphere of a scene and make it possible to create exceptional images at slower shutter speeds under conditions where a tripod might normally be necessary.
The 28-300mm covers an extremely broad range of focal lengths, from a wide 28mm to a super telephoto 300mm. When used with APS-C size digital SLR cameras, the lens provides an angle of view equivalent to approximately 43-465mm. The "Di" design is achieved by applying a new optical design to its coated surfaces, and by further enhancing our already stringent quality control system. Whether you shoot film or digital, the lens provides high image quality for both platforms. The "XR" (Extra Reflective-Index) glass technology results in minimum aberration achieving the same aperture value with a smaller size. An advanced optical design which incorporates special LD glass and internal focusing (IF) make this lens a superb choice for most photographic applications.
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.
A lens with a 1:1 magnification factor produces a projected image on the sensor which is the same as the subject. A 1:1 magnification factor is usually considered the minimum for a lens to be described as a “macro” lens. Specialist macro lenses are often 1:3 or even 1:10 magnification factors, meaning that 1mm across the subject becomes 3mm or 10mm when projected onto the sensor, thus 3 or 10 times magnification.