If it is an indoor wedding, but you want to truly reflect the effect of ambient light (for example, the hotel's surface lighting conditions are very good, and the layering is excellent), it is best to use AV file to control the aperture priority, the range is controlled between 3.5 and 5.6, and the ISO is set to 200- 1000 (according to different lighting conditions, the higher the ISO, the greater the noise, so be careful! ), the metering method is the central key evaluation metering, which can basically ensure the overall metering accuracy. What is more difficult to solve here is white balance. It is recommended to shoot with RAW+ automatic white balance to ensure smooth adjustment in the later period.
If it's outdoor ... it's relatively simple, just pay attention to let the light fill your face under the backlight. If necessary, you can use the TV shutter below ISO 100 and 1/200 for priority, and add an external flash to fill the light of the subject. You can also use the M file to point out the normal situation of face exposure and shoot on this basis.
The specific situation needs specific analysis! What's the problem, you can further determine!