How to use flash and reflective umbrella together?

This is not an ideal lighting method, but from its effect, it can help us understand the lighting characteristics of the "flashlight reflective umbrella": the flashlight is facing the middle of the reflective umbrella, so the light reflected from this part is the strongest, and the more you go to the umbrella, the weaker the light is. Let the handle of the reflective umbrella point to the part you want to focus on. Understanding this feature is the basis for us to use reflective umbrellas well in the next step. The above picture shows the relationship between the color temperature of the light source, the white balance setting of the camera and the final imaging effect. Generally speaking, the color temperature of the flash is close to the color temperature of sunlight, that is, 5500 K-5600 K When using the built-in flash of the camera, the automatic white balance of the camera can be automatically set accordingly. However, when using an external flash, the camera can't judge the color temperature of the light and set it according to the ambient light at that time, so the automatic white balance will be invalid and the white balance needs to be set manually. When shooting indoors with a flash, you can set the camera to "daylight" white balance. Of course, it is best to set the color temperature accurately by manual setting. Using the same set of lights, the color temperature will not change much, so once the setting is accurate, you can always use this setting. 2. On-site lighting: This is the first test sample using lighting. You can see that the brightest part is at the waist of the model, and the light shining on the face is very dramatic, with a large light ratio, and the head is completely immersed in the shadow. However, what we need to shoot portraits is not the drama, but the most beautiful side of the model, so the focus should be on the performance of its appearance. 3. Use the lighting umbrella as the main light source: From the above proofs, although the model's face is well illuminated and the light is much softer after being reflected by the reflective umbrella, careful observation of the lighting effect shows that the light ratio is still too large, and the model's forehead and nose have bright spots. 4. Use a reflective umbrella as the main light and a reflective plate as the supplementary light: If you add a reflective plate to the dark side, use reflective light to distribute light to the shadow, and reduce the light ratio again, you can get a more natural lighting effects than single light. From single lamp to four lamps, you can choose according to your needs. In many cases, you only need a lamp and a reflector to take beautiful pictures of people. I give so many demonstrations to provide you with a way to control the lighting effect. Remember, portrait lighting has no rules, only guiding principles. Practice more and find fun is the true meaning of photography.