Jedna odlična vest za sve one koji su maštali o 24-70mm f/2.8 zumu, a proizvodi iz OEM ponude su im bili finansijski jednostavno nedostižni. Uz malo sreće da Tamron uspe da pogodi optičku formulu na način kako je to uradio na (moram priznati, konstrukcijski ipak jednostavnijem) 17-50mm f/2.8, ovo bi mogao da bude novi sveti gral za ovog proizvođača.
February 6th, 2012, Saitama, Japan － Tamron Co., Ltd., a leading manufacturer of optical equipment, announced the development of the SP 24-70mm F/2.8 Di VC USD (Model A007), a full-size high-speed standard zoom lens equipped with VC ( Vibration Compensation) image stabilization and USD ( Ultrasonic Silent Drive), with resolution at the top of its class.
The price and availability of the SP 24-70mm will be announced at a later date.
Product Features:
1. A full-size, high-speed standard zoom with built-in VC ( Vibration Compensation). Even when shooting in low-light conditions with a slow shutter speed to render sharpness, Tamron’s acclaimed VC allows for stable handheld camera work, to more fully enjoy the benefits of this high-speed zoom lens.
2. Uses special high-grade glass in the three LD elements, three glass molded aspherical lenses, one hybrid aspherical lens and two XR (Extra Refractive Index) glasses, delivering top-of-the-class quality images suited to this high-grade lens. Using a rounded diaphragm, the lens achieves gorgeous blur effects. This rounded diaphragm retains a nearly circular shape even when taken two stops down from its fully open state.
3. Features Tamron proprietary USD ( Ultrasonic Silent Drive) to power a speedy AF drive together with a continuous manual mechanism.
4. This high-speed standard zoom lens has a wide-end focal length of 24mm that expands the photographic area.
5. The lens adopts the new technology including the latest optical design, VC ( Vibration Compensation) image stabilization and USD ( Ultrasonic Silent Drive), all in a lighter and more compact package.
6. Moisture-resistant construction helps prevent water from penetrating the lens.
Specifications:
Model: A007
Focal length: 24-70mm
Maximum aperture: F/2.8
Angle of view (diagonal): 84°04’ －34°21’ (for full frame 35mm format cameras)
60°20’ －22°33’ (for APS-C format cameras)
Lens construction: 17 elements in 12 groups
Minimum focus distance: 0.38m (15.0 in)
Maximum magnification ratio: 1:5 (at f=70mm: MFD 0.38m)
Filter size: φ82mm
Length: 108.5mm*
Entire Length: 116.9mm*
Diameter: φ88.2mm
Weight: 825g*
No. of diaphragm blades: 9 (rounded diaphragm)
Minimum aperture: F/22
Standard accessories: Flower-shaped lens hood
Compatible mounts: Canon, Nikon, Sony
* Length, entire length and weight values given are for the Nikon mount.
* Entire length is the distance between the tip of the lens and the tip of the protrusion.
* The Sony mount does not include VC, because the body of Sony digital SLR cameras includes image stabilization functionality. The product name for Sony cameras is “SP 24-70mm F/2.8 Di USD” without the VC designation.
VC ( Vibration Compensation)
VC ( Vibration Compensation) is Tamron’s proprietary image stabilization system. Tamron’s VC is a three-coil system, whereby three driving coils activate the shake-compensating VC lens group electromagnetically via three steel balls. The VC lens elements are held in place only by contact with the steel balls, achieving smooth movement with little friction. This provides a stable viewfinder image with excellent tracking performance. And as the VC lens may be moved in parallel using only the motorized control, the mechanical structure has been simplified, enabling the creation of a more compact lens.
New VC system (moving coil method)
Tamron’s original VC image stabilization mechanism utilized a moving magnet system whereby a heavy magnet was positioned near the moving VC lens element. In the new VC unit the positions of the magnet and the coil are reversed, because of this the VC optical lens element is attached to the coil. The new VC mechanism employs a moving coil mechanism with a lightweight coil, and the lighter coil reduces the load on the drive system. Thus, the lighter, more compact new VC unit contributes to the lens’s overall light weight and compact size.
Because the 24-70 mm F/2.8 Di VC USD is a high-speed zoom lens with maximum aperture of F/2.8, its VC system must drive a lens that is larger and heavier than other zooms. Therefore, the shape, size and layout of the drive coils are all designed to obtain sufficient thrust. The result is a full-size, high-speed zoom that provides the same high level of compensation effect.
About the ultrasonic motor
In the ultrasonic motor, a piezoelectric element arranged in a ring formation generates ultrasonic vibrations in a metallic ring stator, and the vibration energy is used to rotate a metallic ring rotor that is attached to the stator. The rotation energy is in turn transferred from the metallic ring rotor to operate the focus lens.
Zvanični link:
Tamron EuropeOvaj FF objektiv je nešto lakši nego C/N ekvivalenti i interesantno je da nema naopak zum, što je inače karakteristično za ovu klasu brzih standardnih zumova. To implicira moguće probleme sa flerom, ali o tom, po tom. Još jedna negativna strana tiče se promera prednjeg elementa od ø82mm, što će nabavku kvalitetnijih CPL i UV učiniti dosta skupom.
Za razliku od jeftinijih, krop objektiva (inače u Tamron nomenklaturi označenih "Di II" sufiksom), ovaj se odlikuje FTM fokusom (Full-time-manual; prsten za fokus je moguće ručno pomerati bez prebacivanja u MF položaj), ima "prozorče" za distancu, a sam fokus pogoni Tamronova izvedba USM-a, tzv Ultra Silent Drive (USD).
Novi objektiv donosi i novu verziju optičke stabilizacije (
VC), koji upošljava elektromagnet sa obrnutim položajem solenoida (na optičkom elementu), čime se (po proizvođaču) postižu bolje performanse stabilizacije i smanjuje konačna masa objektiva.
Tu je i zaptivenost koja je obavezna na ovoj klasi objektiva.
Cena zasad nije poznata, a nadajmo se da Tamron neće poći Sigminim stopama i ponuditi (realno) zamensko staklo za novac vrlo blizak ceni OEM proizvoda, jer bi u tom slučaju to bio samo još jedan FAIL koji smo mnogo puta u poslednje vreme videli od gorepomenutog proizvođača. Posebno što Sigmin proizvod nije baš zablistao u optičkom smislu, a varijacije su gotovo neverovatne.
Pozdrav
