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Sigma 28-70mm F2.8 EX DG AutoFocus Wide Angle Zoom Lens             

This is the world's smallest, large and constant aperture zoom lens and is ideal for digital SLR cameras. The power layout of the lens is specially optimized for digital SLR cameras, and Super Multi Coating gives superb color performance whilst cutting down flare and ghost.

Two SLD elements and four aspherical lenses provide the ultimate correction against distortion as well as all types of aberration, especially spherical aberration. Its advanced optical design ensures high performance throughout the entire zoom range.

The use of aspherical lenses in the construction of this lens not only corrects aberrations but also produces a very small and lightweight lens design. Its compact, yet robust, construction has an overall length of 87.2mm (3.4in.), maximum diameter of 74mm (2.9in.), filter size of f67mm and weight of 510g(18.0 ounces). It has a minimum focusing distance of 33cm (13 in.) at all focal lengths and a maximum magnification ratio of 1:4.4 which is very convenient for close-up photography.

The inner focus system allows the lens to be focused without rotating the front element, therefore a Petal-type hood and circular polarizing filters can easily be used.
Features
World's smallest, lightweight, yet Robust, Large Aperture Zoom Lens
EX DG Lens Series; Designed to give an excellent performance with Digital SLR Cameras as well as 35mm Film Cameras
Super Multi Layer (SML) coating reduces ghost and flare
Two pieces of Special Low Dispersion (SLD) elements and four aspherical lenses provide high quality images throughout the entire zoom range
Minimum focusing distance of 13 in. (33cm) at all focal lengths

Specifications
Construction 14 elements in 12 groups
F stop range F2.8/4 - F22 (wide)
Closest Focusing Distance 13" / 33cm
Maximum Magnification 1:4.4
Filter Size 67mm
Dimensions (Length x Diameter) 3.4in. (87.2mm) x 2.9in. (74mm)
Weight 18.0 oz (510 gr)

 
For Canon
 For Konica Minolta

German and French Description

Diese Brennweite haben wir seit vielen Jahren schon als Bestseller im Programm. Jetzt haben unsere Ingenieure noch einmal alle Register gezogen, um dem beliebten Objektiv unsere Digitalempfehlung zukommen zu lassen. Modernste Vergütung, höchste Korrekturwerte, bestmögliche Schärfe – holen Sie aus Ihrer digitalen SLR heraus, was drinsteckt!  Bei einem solch anspruchsvollen Objektiv sind Innenfokussierung und tulpenförmige Gegenlichtblende für uns selbstverständlich – erwähnen wollten wir es trotzdem.
Technische Details
Objektivtyp 28-70/F2,8 EX DG Asp. IF
Kameraanschluss AF: C,MD,ND,P,S
Bildwinkel (diagonal) 75,4°-34,3°
Nahgrenze (cm) 33
Vergrößerung 1:4,4
Filtergröße (mm) 67
Maße (mm)
Durchm. X Länge		 74x87,2
Gewicht (g) 510
Le zoom à grande ouverture constante le plus compact et le plus léger au monde, robuste et performant, optimisé pour le numérique.
Ce zoom standard compact à grande ouverture est optimisé pour le numérique. Il dispose d'une ouverture lumineuse de F2,8 constante sur l'ensemble de sa plage de focales. La présence de deux éléments en verre spécial à faible dispersion (SLD) et de quatre lentilles asphériques assurent une excellente correction de la distorsion et des diverses aberrations optiques. La distance minimale de mise au point de 33 cm permettant d'atteindre un rapport de reproduction de 1:4,4 en prise de vue rapprochée. L'absence de rotation de la lentille frontale lors de la mise au point permet l'adjonction d'un pare-soleil en corolle (fourni) qui le protège efficacement des lumières parasites et facilite l'emploi d'un filtre polarisant circulaire.
Formule optique: 12 groupes - 14 lentilles
dont 4 asphériques et 2 SLD
Angle de champ:
 75,4° - 34,3°
Diaphragme : 9 lames
Ouverture mini : 22
Rapport de reproduction : 1:4,4
Diam. filtre : 67 mm
Distance mini mise au point : 0,33 m
Diam x Lg : 74 mm x 87,2 mm
Poids 510 g