I have observed that the wider the aperture, the more expensive the lenses are. However, I would like to know whether it really makes a difference in your photos or not?
Answer
Yes, there are several reasons for this.
- Larger apertures allow for a smaller depth of field, and generally better bokeh.
- Faster/more accurate auto focus, because more light is available to the focus system.
- Much more versatility, because more light falls on the sensor at a wide aperture, which opens up your options in lower-light settings.
- Better image quality. This is a little more complicated to explain, but imagine you have an option between an f/2.0 lens, or an f/8 lens. If you shoot the same scene with both set to f/8, the f/2.0 will almost always be sharper and have less vignetting. This is because lenses tend to get soft when they are wide open, and by stopping down partially you can improve both sharpness, as well as decrease the light fall-off that creates vignetting.
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