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Compact large aperture standard zoom lens equipped with HSM for the latest digital SLR cameras.
This large aperture standard zoom lens covers focal lengths from 24mm. The latest optical design provides a compact construction and is ideal for general photography. ELD (Extraordinary Low Dispersion) glass, two SLD (Special Low Dispersion) glass elements and three aspherical lenses provide excellent correction of all types of aberrations. This lens incorporates HSM (Hyper Sonic Motor), ensuring a quiet and high speed AF as well as full time manual focus capability. It has a minimum focusing distance of 38cm/15in and a maximum magnification ratio of 1:5.3. The rounded 9 blades diaphragm creates an attractive blur to the out of focus areas.
ELD (Extraordinary Low Dispersion) glass, two SLD (Special Low Dispersion) glass elements and a molded glass aspherical lens provide excellent correction for all types of aberrations. High image quality is assured throughout the entire zoom range. The lens has a compact construction with an overall length of 94.7mm (3.7”). It is ideal for many situations such as portrait, landscape and general photography.This lens offers a large aperture of F2.8 throughout its entire zoom range. It provides freedom of creative expression and is ideal for photography indoors or in low light. HSM ensures a quiet and high speed AF as well as full-time manual focus override by rotation of the focus ring. The inner focusing system eliminates front lens rotation as well as providing high speed AF and convenient handling.
The rounded 9 blade diaphragm creates a soft, attractive blur to the out of focus areas of the image.The super multi-layer coating reduces flare and ghosting and provides high contrast images throughout the lens’ focal length. This lens is equipped with a Petal-type hood to block out extraneous light and reduce internal reflections -
Lens elements 14 Lens groups 12 Optic angle in degrees (35mm) 84.1 -34.3 Optic angle in degrees (SD format mm) 54.8-20.2 Number of diaphragm blades 9 Smallest diaphragm 22 Largest diaphragm 2.8 Shortest focus distance (cm) 38 Maximum enlargement 1:5.3 Filter size 82 Diameter (mm) 88.6 Length (mm) 94.7 Weight (g) 790 Zonnekap Yes Statiefgondel No Case Yes Converter No Mount Canon, Fuji, Konica/Minolta, Nikon, Pentax, Sigma, Sony Barcode(s) - Canon (00851126571542)
- Nikon (00851126571559)
- Pentax (00851126571610)
- Sigma (00851126571566)
- Sony (00851126571627)
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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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