Introduction to photography: what is TTL photometry?

TTL: It refers to measuring light according to the light beam shot by a single-lens reflex camera, and automatically determining exposure according to the measurement results.

Full aperture: the metering aperture facing any light is in the maximum state, which ensures the brightness of framing and does not affect the metering effect.

Evaluation of photometry (which can be linked with any autofocus point): which one is the focus of photometry to increase the accuracy of photometry.

Partial metering (about 9% in the center of the viewfinder): In the case of very complicated light conditions, this mode uses the central alignment subject to meter light to eliminate the interference of surrounding light.