SP 45mm F/1.8 Di VC USD
optical performance, close-focusing
capability and VC
High performance at f/1.8 full aperture
The open aperture is set to f/1.8 with optimised critical properties at a higher level: superb optical performance coupled with a VC system, a shorter MOD, and a well-balanced form factor. Rigorous simulation processes performed throughout the design phase are materialised in distinguished resolving power and beautifully tuned background blur, a prominent feature to a fast-aperture, full-frame compliant optic.
VC (Vibration Compensation) integration sets itself apart
VC really comes into its own when used on high-resolving professional DSLRs which pick up even subtle camera shake. On fast-aperture lenses, VC dramatically extends the ability to shoot handheld under dim light conditions by eliminating camera shake at slower shutter speeds.
This is the very first lens that employs the VC functionality among the fast standard fixed focal lenses in full-frame format*.
USD (Ultrasonic Drive)
The USD actuator converts ultrasonic waves into rotational motion that delivers autofocus with responsiveness, accuracy, and speed without so much as a whisper. The photographer can easily use manual focus at any point while the AF system is operating without having to fumble for a switch.
Get closer than ever before
New MOD specs let photographers shoot at close range, opening a new world of creative opportunities for composition while maintaining image quality.
With an MOD of 0.29m, the SP 45mm offers best-in-class close focusing**. A floating system design feature seamlessly optimises image quality by shifting elements relative to the focus group in close shooting situations.
* As of July 2015. Source: Tamron.
** Rated top among current 45mm and 50mm fixed focal length interchangeable AF lenses for full-frame DSLR cameras excluding macro lenses (As of July 2015. Source: Tamron).
Advanced lens coating produces even sharper, crisper images
This new coating technique developed by Tamron deploys a nano-structured* layer with dimensions smaller than the wavelengths of visible rays of light. Called eBAND (extended Bandwidth & ANgular-Dependency), its ultra-low refractive index, combined with the sophisticated multiple-layer coatings underneath, yields significant anti-reflection properties, absolutely minimising flare and ghosting to deliver sharp, crisp images.
*1nm = 1/1,000,000mm
Developed for industrial optics, fluorine coating offers long-lasting oil and water resistance to the lens. Moisture and smudges wipe away, making it easy to keep your lens clean.
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.
Constructed to prevent moisture from entering the internal mechanisms of the lens, the SP line is sealed to allow photographers to shoot outdoors in adverse conditions.
BBAR Broad-Band Anti-Reflective coating
BBAR coating provides crystal-clear images by suppressing element surface reflections that lead to ghosting and flare.
9 diaphragm blades for superb blur quality
The number of diaphragm blades affects the “shape” of the blur in out-of-focus areas of the image. This is more important in portraiture, where the aperture setting is often wide open, and macro photography, where the high magnification results in blurred background and foreground even at narrow apertures. When backgrounds are soft and blurred, not only is the effect very pleasing and “photographic”, but it also serves to isolate the subject from a distracting background, providing a professional-looking image. A high number of blades provides a rounder shape to the aperture, which in turn makes the shape of the blur more circular and much more natural.
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.
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.
34°28′ (for APS-C format)
520g (18.3oz) for Nikon
89.2mm (3.5 in.) for Nikon
Specifications, appearance, functionality, etc. are subject to change without prior notice.* Length is the distance from the front tip of the lens to the lens mount face.** The circular diaphragm stays almost perfectly circular up to two stops down from maximum aperture.*** Sony mount model without VC.
Optimal image quality for all DSLRs
Tamron Di lenses provide outstanding performance on DSLRs with either full-frame or APS-C format sensors, as well as on 35mm film. Their optical designs and advanced multi-coating techniques assure excellent image quality across the entire picture field.
Tamron’s Di range comprises: