When watching a concert, in the stands, what lens can be used to shoot people clearly? I am using Sony SLR A550 now.

Generally, a lens has two parameters: focal length and aperture. If it's a concert, the focal length of your lens is basically enough. You can cut it later, but the aperture is a little behind. This lens is Sony F4.5-F5.6, if I remember correctly. Concerts are usually held at night, and the light is weak. It is recommended to use the constant aperture lens of F2.8, but this Sony F2.8 only has 70 200 2.8G and 300 2.8g ... The latter is more suitable for concerts, but the price is too high for most people to afford. In fact, it is no problem to shoot a concert with your lens. Between 800- 1600, raise the ISO a little, use a monopod (this is necessary), use the maximum aperture, turn on the fuselage for anti-shake, use continuous focusing, and only focus on the middle. The a550 is the most reliable focusing. Try to take more photos of a scene and choose the best one. Sports photography is similar to yours. The camera lens is awesome, but it is also easy to paste. Just try to improve the success rate and don't mind breaking the membrane.