![]() See “ Part 7: Magnification and Close-ups. Independent producers, such as Sigma, make excellent third-party lenses that are worth investigating if you’re on a budget. Fits: Any F-Stop Mountain Series or Ultra-Light Series backpack. Remember, too, that camera brands such as Canon, Nikon, and Sony make their own proprietary lens. I’ll address these in the next installment. ![]() There are also divisions of these lenses, such as ultra-wide zoom and super-telephoto, and specialty lenses, such as macro and tilt-shift lenses. Telephoto lenses have a focal length of over 100mm.Standard lenses have a focal length of up to 50mm.Wide-angle lenses have a focal length of up to 30mm.Withing the two lens types are three main classes: If you really want to shoot like the pros, you’ll want a 300mm f/4, a 300mm f/2.8, or a 400mm f/2.8. If sports is one of your primary subjects, a telephoto zoom such as a 70-200mm f/2.8 is an excellent choice. A fast lens is usually one that has an aperture of f/4, f/2.8, or larger. A fixed lens will produce naturally sharper images in most cases. Typically, faster telephoto lenses are required. This is why I prefer fixed lenses for most product shoots. While a quality zoom lens can produce exceptional images, the lens’s variability can create distortions. Zoom lenses (at right) have a variable focal length, which makes them versatile. Prime lenses (at left) have a fixed focal length and produce sharp images with excellent contrast. Conversely, a short focal length produces a wider image with less magnification. Photographers call this the “angle of view.” It works in tandem with the magnification to produce an image that will appear very large or very small depending on the focal length.Ī longer focal length produces a more narrow angle of view and higher magnification. The focal length of your lens determines how much of a scene your photo will capture. In this example, if you needed to shoot a product using a 50mm lens, you should have chosen a 35mm lens to get closer to your desired focal length of 50mm.īut what exactly is a focal length, and how does it affect your lens choice? Focal Length This added focal length will produce a more narrow angle of your product and could overshoot your desired field of view. This could affect your final images because a cropped sensor will multiply the focal length of any lens you’re using by its crop factor.įor example, a crop factor of 1.5x with a 50mm lens will replicate a 75mm lens. A camera with a crop factor of 2x means a 35mm film frame is twice the size of your camera’s sensor. ![]() The aperture is the hole in the middle of the lens, made up of rotating blades that open to let in light when you press the shutter. While focal length itself refers to the field of view of a lens, f-stop is about how much light you allow to hit the sensor via the aperture opening. Source: .Ī crop factor is the ratio of a camera’s sensor size to a 35mm film frame. The f in f-stop stands for the focal length of the lens. A cropped sensor captures less than the focal length. A full-frame sensor is a true representation of the lens’s focal length - how much of the viewfinder is captured in the image.
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