Photographers often encounter problems focusing new lenses.
The Tamron AF 28-75mm is a high performance mid-range zoom lens. It is most commonly used with digital single-lens reflex (SLR) cameras. Users often encounter problems with automatic and manual focusing. Unfocused pictures tend to be blurry and of poor quality.
Distance from Object
The minimum focusing distance on the Tamron AF 28-75mm camera lens is 13 inches. Objects you want to photograph must be more than 13 inches away from the camera, otherwise the lens cannot properly focus. The focusing distance is determined by the minimum aperture size, which is f/2.8 on the Tamron AF 28-75mm.
Focus Setting
Unfocused photographs make images blurry and unrecognizable.
Check to make sure the lens is set to automatic focus. Lenses like the Tamron 28-75mm can be set to manual or automatic focus. The focus setting is a sliding button that can be found on the side of the lens. If the Tamron AF 28-75mm is set to manual focus, the lens will be set to the focus settings of the most recently-taken photograph. Automatic focus will automatically adjust aperture and shutter speed for clear focusing.
Shutter Speed
If the shutter speed is set at or below 60, the camera must be securely placed on a tripod. Shutter speed determines how long the aperture, or opening, of the camera remains open. At the very least, the photographer must steady their self against a wall or other sturdy object. If not, photographs taken at or below a shutter speed of 60 will be blurry and unfocused.
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