Consult the old bird of photography

AE-L exposure lock function is suitable for scenes where the light source and camera position do not change, and it is mainly used for A-file S-file

In the environment with large contrast between light and dark, to ensure the normal light exposure of the exposure subject

Honestly, didn't you pay attention when you bought the three focal lengths of DA177 DA7 DA4?

tourist portraits mainly focus on 17-7, and only use it when shooting small and medium-sized scenes with DA7 (it is recommended to take a close-up shot of Pentax after putting on makeup).