What is a "fast lens"?
Posted by Oriccabattery01
from the Business category at
02 Apr 2025 02:11:11 am.
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</DIVicture>"Fast lenses" are highly prized, but whatisa fast lens – and why is it is something that most photographers and videographers value, no matter what type of shooting they’re into?
Lens "speed" is a term that describes the maximum aperture diameter, and refers to how wide the aperture can open, measured by thef-stopnumber. Basically, the smaller the f-stop, the larger the aperture opening So what is a fast lens? One where the aperture opens wide, such as f/1.8 or f/1.2.
Lenses that can open wider usually cost more, and for good reason – they offer better performance. To understand why an optic with a wider aperture is attractive, you need to take theexposure triangleinto account. A wider opening lets a lot more light hit the camera sensor, which is a game-changer in low-light situations to keep shots well-exposed.
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What is a fast lens? One with a wide maximum aperture, which means a low f-number – such as f/1.2
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Plus, if you're shooting fast-moving subjects, like cars in a race, a quickshutter speedis crucial. Since a fast shutter only lets in light for a short time, a wider aperture helps balance that out by allowing more light to hit the sensor, leading to a balanced exposure.
For portrait photographers, going with a lens that has a wide aperture is really important. A larger opening (think low f-stop number) creates a shallowdepth of fieldand pleasing “bokeh.”
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This effect blurs the foreground and background, making the subject pop and drawing the viewer's attention right where you want it, while distracting elements fade into the background.
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