![]() Further good news is that there’s an affordable 50mm f/1.8 lens available for most cameras. However, on an APS-C format camera it produces an equivalent focal length of around 75mm, which is great for portraiture, and if the maximum aperture is f/1.8 you can really throw out the background to get some lovely bokeh and background blur. On a full-frame camera, a 50mm lens produces an angle of view that’s close to what we see with our eyes. Prime lenses are available in all sorts of focal lengths but 35mm and 50mm lenses tend to be more attractive for low-light photography. They’re also often small and lightweight, which makes them discreet to use and attractive to carry just in case you find yourself out taking pictures when light levels are falling. Because of that, the shutter doesnt have to stay open as long to make a correctly exposed. ![]() Prime lenses are lenses with a fixed focal length and most have a larger aperture than a zoom lens covering the same focal length. a wide aperture (low f/stop) means more light is entering the lens. Here though, we’re talking lenses, so to start off, we’re going to look at some cheap prime lenses with large apertures. A large aperture is always the preferred option when it comes to letting more light in, and it doesn’t have to be expensive.įor more low-light options, you can check out our guide to the best low-light cameras. An equivalent gain of light in those terms would mean shooting at 1/5sec rather than 1/50sec (a tall order to keep sharp, even with image stabilisation), or shooting at ISO 25,600 rather than ISO 2,500. What’s more, you got this without slowing your shutter speed, and potentially compromising sharpness, or raising your ISO, which would increase image noise. If we had a 50mm lens and an f-stop of f/1.0, our aperture would be 50 millimeters across. So the opening in your lens is exactly 10 millimeters across. If the f-stop you want to choose is f/8, you will get the fraction 80/8. ![]() Swap that out for a 50mm prime with an aperture of f/1.8, and suddenly you’ve got 3.3EV (3.3 stops) more light hitting your camera sensor. Let’s say, you’re now using an 80mm lens. Say you’re using a kit zoom, and it has a maximum aperture of f/5.6 when used at its maximum focal length of 55mm. A 35mm camera lens may not need as high of an f-stop as a macro lens to achieve the same depth of field. However, f-stop settings vary depending on the lens. How does a good lens extend your low-light shooting range? There are a few key factors – as we’ll get into – but the key one is maximum aperture. To keep a photo’s foreground and background in focus, photographers use higher f-stop numbers. ![]() Low light portrait © Janko Ferlič on Unsplash ![]()
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