The new Canon 550D feels that the shutter speed is very slow.

If you have nothing wrong with shooting other things, and you have this problem when shooting grass, it is not the problem of the fuselage and lens. There may be two reasons:

1, it may be that your body or fuselage blocks the light;

2. Maybe it's the focus. You said you were out of focus. Maybe you were close, and there was no focus. The focus was on a dark background.

Try not to block the light of the grass, pay attention to the green dot in the lower right corner of the viewfinder to see if it is in focus and see if the grass is clearly in focus. Another shot should be fine.

It's exposure The aperture is too small, the shutter is too fast and the sensitivity is too low. It must be underexposed, so it can only be black. Generally speaking, if you are not very skilled, don't shoot in M file. If you want to shoot, first use AV mode (aperture first) to shoot a few pictures, and then shoot manually according to the actual situation.

According to your actual situation, it is suggested to shoot first with the aperture, with the focal length adjusted to 55 and the aperture adjusted to 5.6, and then shoot. First set the sensitivity to 100, and look at the shutter in the lower left corner. If it is lower than 1/30 seconds, increase the sensitivity until the shutter speed is higher than 1/30. Because the lens of 18-55 has anti-shake function, the shutter of 1/30 can be shot clearly. Your own initial example, aperture 5.6, shutter 1/8 seconds, ISO 100, you can shoot clearly by raising the ISO value to 400. Because you are in the daytime, you can adjust the angle.

There is not enough light at night, so you can only shoot it with a tripod. If you don't want to use a tripod and want to adjust the shutter to a safe shutter, you can only improve the sensitivity. Increasing sensitivity will lead to premature delivery, which is also a helpless move. It is more important to take clear photos. In fact, even if the sensitivity is relatively high, if it is only used online and viewed on the computer, the effect will not have much impact.