How Your Camera Lens Works Focusing Options Make sure to
How Your Camera Lens Works Focusing Options Make sure to activate your focusing grid so that you are able to control which part of the image you wish to focus upon. M – Manual – Using the camera’s focusing ring to achieve proper focus S – Single – Auto focus is attempted when the shutter release is half-way pressed C – Continuous – Auto focus is constantly recalculated as long as the shutter is half-way pressed. Focal Length The size of your lens affects the perspective of what you are photographing. The standard lens for a full frame DSLR camera is 40mm-50mm. When you have a 50mm lens on your camera, your lens will create a photograph that appears the same as when you view it with your own eyes: a 1:1 ratio. With a wide-angle lens, such as 24mm or 35mm, you can capture more of a scene because the wider the focal length of the lens, the broader of a view it has. When you use a telephoto lens, such as a 180 or 300mm, you photograph a zoom-in area of a scene and make it appear as if it is closer. Because telephoto lenses have a larger focal length, the view is much smaller than a normal lens. DX or APS-C Format FX-“Full Frame” Format 18mm - 24mm Wide Angle Lens 20mm-35mm 40mm Standard” Lens 50mm 180mm Telephoto Lens 300mm 18mm – 55mm 55mm – 200mm Standard Zooms Telephoto Zooms 28mm – 90mm 75mm – 300mm DX Lenses vs. FX Lenses Crop Factor Depth of Field Depth of Field (DOF) – This term refers to the areas of the photograph both in front and behind of the main focus point. Depth of field is affected by the aperture, subject distance and focal length. If anything behind or in front of the main focus point appears blurred, the photograph has a shallow depth of field (taken with a wide open aperture such as f/2). If the subjects behind and in front of the main focus point are in focus, the photograph has a greater depth of field (taken with a small aperture such as f / 22).
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