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Super compact and lightweight, large aperture telephoto lens with life-size macro capability.
This large aperture telephoto macro lens enables you to shoot up to 1:1 life size close-ups. Its large F2.8 aperture makes it an ideal lens for digital SLR as well as film SLR cameras.
Two Special Low Dispersion (SLD) glass elements control various color aberrations and assure high image quality. Super Multi Coating gives superb color performance whilst cutting down flare and ghost. Its compact, yet advanced, construction has an overall length of 137mm, maximum diameter of 79.6mm, filter size of 72mm and weight of 895grams.Tele macro lenses have a greater working distance. It is possible to enjoy Macro photography, even when you are far from subject. This enables you to capture the small animals and insects without disturbing them. Very narrow depth-of-field allows selective focusing and less distracting backgrounds. Large aperture of F2.8 is ideal for sports, action and indoor photography.
Two SLD glass elements control various color aberrations and assure high and sharp image quality.
The HSM models provide ultra quiet high-speed autofocusing as well as full-time manual focus override.
A floating focusing system moves two different lens groups in the optical system to different positions. This system compensates for astigmatic aberration and spherical aberration. Since focusing does not change its overall length, this lens is easy to hold and use.
“Super Multi Layer Coating” of this lens gives superb color performance whilst cutting down flare and ghost caused by reflections from the digital image sensor.
It is also possible to use this lens with Sigma 1.4x EX and 2x EX APO Tele-Converter. When this lens is used with the 1.4x EX or 2x EX Apo Tele Converters (optional), it becomes a 210mm F4 AF tele-macro lens or a 300mm F5.6 MF tele-macro lens respectively
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Lens elements 13 Lens groups 10 Optic angle in degrees (35mm) 13.7 Optic angle in degrees (SD format mm) 7,9 Number of diaphragm blades 9 Smallest diaphragm 32 Largest diaphragm 3.5 Shortest focus distance (cm) 46 Maximum enlargement 1:1 Filter size 72 Diameter (mm) 80 Length (mm) 182 Weight (g) 965 Zonnekap Yes Statiefgondel Yes Case Yes Converter No Mount Canon, Fuji, Nikon, Sigma, Sony Barcode(s) - Canon (0085126105549)
- Nikon (0085126105556)
- Sigma (0085126105563)
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MTF (Modulation Transfer Function; modulatieoverdrachtsfunctie) is een van de metingen die worden verricht om de optische prestaties van een objectief te bepalen. Men meet hiertoe het beeldcontrast bij verschillende ruimtelijke frequenties (lijnparen per millimeter).De horizontale as is verdeeld in millimeters en toont de afstand van het midden tot de rand van het beeld. De bijbehorende contrastwaarde (maximaal 1) is uitgezet op de verticale as.
De waarde bij 10 lijnparen per millimeter geeft het objectiefcontrast aan (rode lijntjes). De zich herhalende fijne parallelle lijnen bij 30 lijnparen per millimeter geven het scheidend vermogen (scherpte) van het objectief bij de volle opening aan.
De zich herhalende fijne parallelle lijnen die in de diagonale richting van de ene naar de andere hoek van het beeld lopen worden Sagittale lijnparen (S) genoemd. De lijnen die daar loodrecht op staan worden Tangentiale lijnparen (T) genoemd. -
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