A constant-aperture high-speed standard zoom lens with image stabilisation
Photographic artists have been waiting for a full-featured, constant-aperture zoom lens. The wait is over.
This lens is a high-quality, highly functional, high-speed standard zoom lens covering the 24‒70mm focal range. It includes both Tamron's proprietary VC (Vibration Compensation) image stabilisation to reduce shake and its USD (Ultrasonic Silent Drive) motor, enabling speedy, silent autofocusing.
This SP (Super Performance) series lens makes full use of specialised glass elements in its lens layout, designed with top priority on image quality, including three LD (Low Dispersion) elements and two XR (Extra Refractive Index) glasses. Tamron has minimised all types of chromatic aberration in the lens, making it a lens at the top of its class whether you use it on a digital APS-C, full-frame, or 35mm SLR camera.
The lens combines a constant f/2.8 maximum aperture and Tamron's rounded diaphragm* for an ideal character of brilliant resolution and beautifully soft, natural-looking blur effects.
It is also Tamron's first lens to feature our new moisture-resistant construction, making it an ideal choice for outdoor shooting. Portraits. Landscapes. Studio shoots. This is the lens for them all.
Capture the finest details of your images in precisely the way you have always wanted to. Extend your art to the limits of your inspiration with the Tamron A007.
- For fast-aperture standard zoom lens compatible with full-frame size SLR cameras except with Sony full-frame size SLR cameras.Current as of February 2012. (Source: Tamron).
- USD (Ultrasonic Silent Drive) is Tamron's proprietary ultrasonic motor drive.
- The Sony mount does not include VC, because the body of Sony digital SLR cameras includes image stabilisation functionality. The product name for Sony cameras is "SP 24-70mm F/2.8 Di USD" without the VC designation.
- This rounded diaphragm retains a nearly circular shape even when taken two stops down from its fully open state.
VC (Vibration Compensation)
Even when shooting in low-light conditions with a slow shutter speed, Tamron’s acclaimed VC (Vibration Compensation)* allows for stable handheld camera work, to enchance the usefulness of a fast-aperture zoom lens.
* The Sony mount lens does not include VC, because the body of Sony digital SLR cameras includes image stabilisation functionality. The product name for Sony cameras is “SP 24-70mm F/2.8 Di USD” without the VC designation.
Advanced optical technology
Specialised high-grade glass in the three LD elements, three Glass Molded Aspherical Lenses, one Hybrid Aspherical Lens and two XR (Extra Refractive Index) elements all contribute to the top-of-class image quality expected of a high-grade Tamron SP lens.
The rounded outline diaphragm of the lens is retained even when stopped down to f/5.6. Blur highlights in a photo reflect the shape of the aperture and they are a much more prominent feature at wider apertures. In this high-speed lens, this important optical design element results in more attractive, natural-looking images.
USD (Ultrasonic Silent Drive)
Tamron’s proprietary USD (Ultrasonic Silent Drive) powers a speedy autofocus system. Major improvements in autofocus response and tracking ability over standard DC motors enable instantaneous focusing and spontaneous shooting of rapidly moving subjects.This extremely quiet motor is ideal for photography of events, weddings, theatre or musical performances, as well as crucial moments on the golf course – any situation where autofocus noise is obtrusive.
Direct Manual Focus
The USD motor is complemented by Direct Manual Focus to enable manual fine-tuning after autofocusing if and when necessary. No need to engage a switch – just gently rotate the focus ring.
Tamron’s new moisture-resistant construction helps prevent water from penetrating the lens, making it even more ideal for travel and shooting outdoors.
Flower-shaped hood is supplied with the lens to shield stray light
Included as a standard accessory, the flower-shaped hood matches the rectangular shape of the image sensor to most effectively block the interference of superfluous light rays entering from outside the borders of the image area, helping to ensure sharp, clear, flare-free images with crisp detail in the shadow areas.
Form and texture that embodies the high-performance, high-precision qualities of the SP series
This lens features the gold metal ring that symbolises the SP series, and other design elements that boost its looks.
Sharpens edges by reducing ‘colour fringing’
Chromatic aberration occurs when a lens element refracts different wavelengths of a ray of light – its rainbow colours – at very slightly different angles. This results in the ‘colour fringing’ that reduces the sharpness of an image. LD elements are made from special glass materials with extremely low dispersion indices (i.e. the refraction of a ray of light into rainbow colours is extremely narrow). Thus they effectively compensate for chromatic aberration at the centre of the field (on axis), a particular problem at long focal lengths (the telephoto end of the zoom range), and for lateral chromatic aberration (toward the edges of the field) that often occurs at short (wideangle) focal lengths.
Although costly, LD glass materials result in clear, vivid image quality.
Far superior image quality – while reducing lens size and weight
Tamron uses several hybrid aspherical lens elements in its lenses bearing the Aspherical designation. The benefits are two-fold: first, their non-spherical shapes virtually eliminate spherical aberration and image distortion. Second, as one hybrid aspherical lens element can take the place of multiple elements without compromising performance, they allow the lens to be much more compact.
As a result, these innovative optics have played a crucial role in delivering uniformly high image quality across all apertures and focal lengths of extraordinarily compact ultra-zoom lenses.
Compensates for camera blur on long shutter speeds – for sharp images in much less light
Tamron’s unique VC mechanism uses a proprietary actuator and algorithms to deliver an extremely stable viewfinder image with excellent tracking. The mechanism employs a tri-axial system in which three driving coils move internal optical components within the VC lens electromagnetically, based on signals originating from three steel ball bearings. The VC lens elements are held in place only by contact with the steel balls, achieving smooth movement with minimal friction. The simplicity of this mechanical structure is also one of the secrets of Tamron’s compact lens sizes.
Fine manual focus adjustments can be made quickly and easily
The USD motor is complemented by DMF (Direct Manual Focus) to enable manual fine-tuning after autofocusing if and when necessary. No need to engage a switch – just gently rotate the focus ring on the lens.
Ultrasonic Silent Drive
‘Travelling waves’ generate a fast, smooth AF movement
Tamron’s USD works with the high-frequency ultrasonic vibrations that are produced by a ring called a ‘stator’. Energy from the vibrations is used to rotate an attached metallic ring known as the ‘rotor’. Piezoelectric ceramic is a material that produces ultrasonic vibrations when voltage of a specific frequency is applied is arranged in a ring formation on the stator. This electrode configuration of piezoelectric ceramic causes two ultrasonic vibrations to occur in the stator. By effectively combining these two ultrasonic vibrations, it is possible to convert the energy from the vibrations that produce simple motion into energy known as ‘deflective travelling waves’, which move around the circumference of the ring. The friction between these deflective travelling waves created on the metallic surface of the stator and the surface of the rotor produces force, causing the rotor to rotate. Attached to the rotor is the focusing lens, which is given a fast, smooth autofocus movement.
Extra Refractive Index
More compact lenses with superior image quality
XR (Extra Refractive Index) glass can bend light rays at steeper angles, thereby decreasing the physical length of the lens while enhancing imaging performance by minimising optical aberrations. With its superior light-bending power, XR glass makes it possible to design a short-barrel lens with the same light-gathering ability (aperture value) as a long-barrel lens – even with a smaller lens diameter. By using this principle Tamron has been able to shorten the length of the entire optical system and produce lighter, more compact lenses of the same speed, and also to provide greater zoom ranges in lenses that are much more convenient to carry and hand-hold.
XR glass is costlier than conventional glass but it yields enhanced optical power distribution, making the innovative XR lens designs possible.
Super Performance series
Performance takes priority for superb image quality
This line of ultra-high-performance lenses is designed and manufactured to the exacting specifications demanded by professionals and others who require the highest possible image quality. The foremost priority is achieving superior performance parameters – high design standards take priority over cost constraints. As a result, Tamron SP lenses feature innovative designs that have established an enviable reputation for excellence amongst demanding photographers.
Angles of view (diagonal)
84° 4′ to 34° 21′ (full-frame 35mm format)
60° 20′ to 22° 33′ (for APS-C format)
17 elements in 12 groups, including:3x LD elements3x glass molded aspherical lenses
1x hybrid aspherical lens
2x XR (Extra Refractive Index) elements
Minimum focus distance
Maximum magnification ratio
1:5 (at f=70mm: MFD 0.38m)
9 (rounded diaphragm)
Flower-shaped Lens Hood
Canon AF, Sony (Konica Minolta), Nikon AF-D
Specifications, appearance, functionality, etc. may change without prior notice.*Length, entire length and weight values given are for the Nikon mount.
1. Distance between the mount face and the tip of the lens.
2. Distance between the tip of the lens and the tip of the protrusion.