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Basic Photography | When and Why Do You Need Fast Lens?
© 2011 Wazari Wazir | Mother and Son at Kinokuniya Book Store | 50mm | f/1.8 | 1/125 | ISO 1000 Before we talk about when and why do you need a fast lens, lets get to know what is fast lens for those of you who doesn’t know about it. Basically “Fast Lens” refer to the lens that have big aperture at its maximum aperture. Usually any lens that have its maximum aperture which start at f/2.8 and below is consider a fast lens. The reason that a lens with a big maximum aperture is referred to as fast is that it lets more light in and therefore you can use…
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Basic Photography | What is a Fast Lens?
© 2007 Wazari Wazir | Raptor Watch | Tanjung Tuan Malacca Lens speed refers to the maximum aperture diameter, or minimum f-number, of a photographic lens. A lens with a larger maximum aperture (that is, a smaller minimum f-number) is a fast lens because it delivers more light intensity (illuminance) to the focal plane, allowing a faster shutter speed. A smaller maximum aperture (larger minimum f-number) is “slow” because it delivers less light intensity and requires a slower shutter speed. A lens may be referred to as “fast” or “slow” depending on its maximum aperture compared to other lenses of similar focal length designed for a similar film format. Lens speed given by the minimum f-number, or alternatively maximum aperture diameter or maximum numerical aperture,…