1. First of all, choose cloudy or cloudy weather, that is, don't have direct sunlight, if it is really not possible, go to the shadow.

2. People occupy three or four rows, preferably where there are steps.

3. Camera ISO is set to 100, aperture is set to 1 1, metering mode is changed to spot metering, exposure mode is set to file, and exposure compensation is set to+1.

4. Measure the exposure value of the face at the distance of 1 m, and remember the shutter speed at this time.

5. Change the camera exposure mode to m, fix the aperture at 1 1, and change the shutter to the one you just remembered.

6. Set the focal length of the camera to about 35 (the focal length of the camera is adjusted to 28 at 7d), construct a picture, support the camera with a tripod, change the focusing mode to a single point, and aim at the second row of men's faces.

7. Change the camera shooting mode to continuous shooting, shout slogans, and then continuous shooting 5,,, and then repeat twice. * * * About 15.

8. Check the display screen and make fine adjustments if there is any dissatisfaction.