Sigma 28-70mm F2.8 EX Aspherical Lens for Canon-AF Camera User Manual

Introducció

This manual provides essential instructions for the proper use and care of your Sigma 28-70mm F2.8 EX Aspherical Lens, designed specifically for Canon-AF SLR cameras. This lens offers a versatile focal range and a constant f/2.8 maximum aperture, making it suitable for various photographic situations. Please read this manual thoroughly before using the lens to ensure optimal performance and longevity.

Figure 1: Sigma 28-70mm F2.8 EX Aspherical Lens. This image illustrates the overall appearance of the lens.

Configuració

Col·locació de la lent

1. Assegureu-vos que tant la càmera com l'objectiu estiguin nets i sense pols.
2. Traieu la tapa posterior de l'objectiu i la tapa del cos de la càmera.
3. Align the mounting index (usually a red dot or white line) on the lens barrel with the corresponding index on the camera body.
4. Introduïu l'objectiu a la muntura de la càmera i gireu-lo en sentit horari fins que encaixi. No forceu l'objectiu.

Figure 2: Illustrative image of a lens being attached to a camera body. Ensure alignment marks are matched before rotating.

Extracció de la lent

1. Apagueu la càmera.
2. Mentre premeu el botó d'alliberament de l'objectiu del cos de la càmera, gireu l'objectiu en sentit antihorari fins que s'aturi.
3. Traieu amb cura l'objectiu del suport de la càmera.
4. Attach the rear lens cap to the lens and the body cap to the camera to protect the sensor and lens elements.

Funcionament de la lent

Centrant-se

This lens supports both autofocus (AF) and manual focus (MF). The focus mode switch is located on the side of the lens barrel.

• Enfocament automàtic (AF): Set the switch to 'AF'. The camera will automatically focus when the shutter button is half-pressed.
• Enfocament manual (MF): Set the switch to 'MF'. Rotate the focus ring on the lens barrel to achieve sharp focus. Use the camera's viewfinder or LCD screen to assist with focusing.

The minimum focusing distance for this lens is 15.7 inches (approximately 40 cm) across all focal lengths.

Zoom

To change the focal length, rotate the zoom ring on the lens barrel. The lens offers a focal range from 28mm (wide-angle) to 70mm (short telephoto). The current focal length is indicated by markings on the lens barrel.

Figure 3: Illustrative image showing the location of the focus and zoom rings on the lens barrel.

Control d'obertura

This lens features a constant maximum aperture of F2.8 throughout its zoom range. Aperture settings are controlled via the camera body. Refer to your camera's instruction manual for details on adjusting aperture.

Ús de filtres

The lens incorporates helical focusing, which means the front lens barrel does not rotate during focusing. This design is convenient for using polarizing filters or other filters that require precise orientation.

Manteniment

Neteja de la lent

• Use a blower brush to remove dust and loose particles from the lens surfaces.
• Per a taques o empremtes dactilars, apliqueu una petita quantitat de solució netejadora de lents a un drap de microfibra net i netegeu suaument la lent amb moviments circulars des del centre cap a l'exterior.
• Never use abrasive materials, solvents, or household cleaners on the lens.

Emmagatzematge

• Col·loqueu sempre les tapes frontal i posterior de l'objectiu quan no l'utilitzeu.
• Guardeu la lent en un lloc fresc i sec, allunyat de la llum solar directa i de temperatures extremes.
• Si l'emmagatzemeu durant períodes prolongats, considereu l'ús d'un agent deshumidificant per evitar el creixement de floridura.

Resolució de problemes

• Lent no reconeguda per la càmera: Ensure the lens is securely attached and clicked into place. Turn the camera off and on again. Clean the electrical contacts on both the lens and camera body with a clean, dry cloth.
• L'enfocament automàtic no funciona: Check if the lens is set to 'AF' mode. Ensure there is sufficient light and contrast in the scene for the camera's autofocus system to operate effectively.
• Les imatges són borroses: Verify that the lens is properly focused. Check the camera's shutter speed to ensure it's fast enough to prevent motion blur, especially in low light or with moving subjects. Ensure the lens elements are clean.

If problems persist, consult your camera's manual or contact Sigma customer support.

Especificacions

Garantia i Suport

For information regarding warranty coverage, service, or technical support, please refer to the warranty card included with your product or visit the official Sigma Corporation of America weblloc web. Conserveu el rebut de compra com a comprovant de compra per a reclamacions de garantia.

Fabricant: Sigma Corporation of America