How does Canon 550D set shutter speed and aperture value?

Oh, that's P, isn't it? Aperture and shutter machine will be given automatically, and no adjustment is needed, so they are all displayed as blank. If you want to adjust the AV file of the aperture, you can see that the shutter speed is blank. As long as the aperture is manually adjusted, the shutter speed can be automatically obtained. By adjusting the shutter TV file, you can see that the aperture size is blank. You can automatically get the aperture size by manually adjusting the shutter speed. If you want to adjust the two manually, use M gear. At this point, no parameters are blank. You can manually adjust the aperture of f/8 and the shutter speed of1125. If you have any more photography questions, please feel free to contact me.