Why should I use a 50mm F1.8 lens for portraits?

Taking portraits of a focal length to be appropriate, not that other focal lengths can not shoot, but in general, shooting portraits are between 50-135mm, and especially to 85-105mm for the most common, which is for full-frame, for the APS-c, to be divided by 1.5 or 1.6; two is the aperture as large as possible, that brother said good, large aperture can be very good bokeh off the background, highlighting the subject! The second is to make the aperture as large as possible.

If you are using a general APS-c format camera, 50mm standard head hang up equivalent to 135 cameras 75 or 80mm, just more suitable for portraits of the zone, and the standard head aperture is very easy to do big, the price is cheap, so the use of this shoot portraits of that is quite a lot, the effect is also good. (Large aperture in the indoor also take advantage of the cheap, especially to shoot small children, do not want to turn on the lights to shake the child's eyes, open the large aperture it)