Large aperture advantage in low light?

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mobi1
mobi1 Regular Member • Posts: 396
Large aperture advantage in low light?

People often say that larger aperture lenses are good for low light photography.

Suppose I'm shooting indoor with kit lens 18-55 f/3.5-5.6. The largest aperture I can use here is f/3.5 with 18 mm.

If I have another lens, say 18 mm f/1.8, I can shoot at f/1.8 to allow more light but then it will also create shalow depth of field so that I'd loose sharpness on objects which I do want to keep in focus.

So where is the advantage of larger aperture in low light? 

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