What's the difference between shooting with an optical viewfinder and shooting with an LCD screen? Why are the photos taken with the same settings so different?

In the principle of framing, there is no difference between the two, they are all automatically controlled and handed over to the camera computer for processing. Difference: the same photoreceptor, the same metering, the same focal length, the same shutter, automatic ISO should not be different. Personal feelings:

First of all, I'm not used to the viewfinder. The composition is arbitrary (shoot if you don't like it), and the shutter action is inappropriate (the fingers of the left and right hands, especially the right hand, are not well controlled).

Second, all the data captured by the viewfinder are displayed inside, while the display screen pays more attention to composition. Small differences in composition may lead to changes in light, and small changes in light may cause great changes in aperture, shutter speed, photometry and ranging.

Conclusion: I'm still learning the manipulation of SLR lens.

If you put the SLR camera in the fully automatic shooting position, it is not much different from the "fool" machine. When using viewfinder to find scenery, we should pay more attention to the influence of lens zoom on aperture and shutter speed.

First of all, different exposure modes should be selected according to different subjects and conditions, instead of all "automatic". Then, pay attention to determine one option first, how the other options change, and what impact it has on the photo. For example: independently determine an aperture value and see the change of shutter speed; To take a picture of fluid or motion, first determine a speed, see the change of aperture, and see their influence in the final photo.

Secondly, observe the influence of composition on the shooting data in the viewfinder. For example: the change of light and brightness in composition, the influence on aperture and shutter speed, and how to control it.

Third, set the focal length to different gears, and observe the influence of different focal lengths on the photos. In the end, you may use more focal lengths.

Finally, you will gradually adapt to autonomous metering, ranging, selecting focus, and designing aperture and shutter speed independently, while the automatic function and data display of the camera are only for your reference.

This road requires us to learn more about photography, which is why we bought a SLR.