SIGMA 120-300/2.8 e macro 150/2.8 OS, click per ingrandire
[Photokina 2010] SIGMA presenta le edizioni rinnovate del suo super zoom 120-300mm F2,8 e del popolare obiettivo macro 150mm F2,8 in versione OS, entrambe stabilizzate. Questa notizia farà certamente la felicità dei molti appassionati del marchio, in particolare degli estimatori del 150mm!
Il nuovo super-zoom 120-300/2.8 OS è caratterizzato da una formula ottica che vede ben 23 elementi raccolti in 18 gruppi, 2 elementi FLD ed uno SLD; distanza minima di messa a fuoco di 1,5 e 2,5 metri a 120 e 300mm rispettivamente; diaframma a 9 lamelle arrotondate; motore AF ad ultrasuoni; sistema OS in grado di compensare per 4 f-stop (sulla carta, in linea con le ultime offerte Nikon/Canon); diametro filtri da 105mm. Corpo tropicalizzato.
E veniamo al macro 150/2.8. Adesso in versione OS (4 f-stop), eredita dalla precedente versione le caratteristiche principali che ne hanno decretato il successo: formula ottica con 19 elementi in 13 gruppi e tre elementi SLD; rapporto ingrandimento 1:1 con distanza min. di messa a fuoco di 38 centimetri; motore AF ad ultrasuoni; diaframma a 9 lamelle arrotondate.
Da notare come tutte le nuove ottiche prodotte da SIGMA abbiano una nuova finitura superficiale in luogo di quella precedente.
Press Release Ufficiale 120-300/2.8 OS (lingua inglese)
The Sigma Corporation is pleased to announce the new Sigma APO 120-300mm F2.8 EX DG OS HSM, which offers improved optical performance. This large aperture zoom lens features Sigma’s OS (Optical Stabilizer) function and weather-resistant design throughout for use in harsh conditions.
One SLD and Two FLD glass elements are used for maximum correction of chromatic aberrations. The Super Multi-Layer lens coating reduces flare and ghosting and the lens design incorporates an inner focusing and inner zooming system to ensure sharp images throughout the entire zoom range.
Improved optical performances provides excellent correction of sagittal coma flare and ensures ultra-high resolution, comparable to a fixed focal length lens.
The OS function offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible and enables hand held tele-photography.
Incorporation of HSM (Hyper Sonic Motor) ensures quiet and high speed AF, while allowing full-time manual focus override. The rounded 9 blade diaphragm creates an attractive blur to the out of focus areas of the image.
The addition of the optional APO 1.4x EX DG and 2x EX DG Tele Converters produces an ultra telephoto zoom lens with AF.
Press Release Ufficiale Macro 150/2.8 OS (lingua inglese)
The Sigma Corporation is pleased to announce the Sigma APO MACRO 150mm F2.8 EX DG OS HSM, a large aperture medium telephoto macro lens which incorporates Sigma’s original Optical Stabilizer function.
Successor to the APO MACRO 150mm F2.8 EX DG HSM, introduced to market in October 2004, this new OS design offers the latest optical technology. A floating focusing system moves two different lens groups in the optical path to different positions. This system compensates for astigmatic aberration and spherical aberration and provides extremely high optical performance from infinity to 1:1 Macro.
Three SLD (Special Low Dispersion) glass elements provide excellent correction of all types of aberrations and the Super Multi-Layer Coating reduces flare and ghosting. This lens has superior peripheral brightness and provides sharp, high contrast images even at the maximum apertures.
Equipped with Sigma’s proprietary OS (Optical Stabiliser) function, this lens offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible. The HSM (Hyper Sonic Motor) ensures quiet and high speed autofocus as well as full-time manual focus capability.
This lens has a rounded 9 blade diaphragm creating a smooth blur to the out of focus areas of the image. It is also possible to use this lens with Sigma’s optional APO Tele Converters.
[Photokina 2010] SIGMA 120-300 F2.8 e 150mm macro Stabilizzati - [BLOG]
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