What is the use of SLR cable release?

First of all, cable release includes wired cable release and wireless cable release, and the difference between mechanical cable release and electronic cable release.

The function of wired pay-off will be used in the following situations: the fixed beat remains absolutely stable, which is also the core function of pay-off, that is, to remain stable. Commonly used when shooting night scenes and time-lapse photography.

Secondly, the wireless shutter can increase the distance. For example, if no one is taking your picture next to you and you want to take a group photo, the wireless shutter is useful at this time.

Three, the above two are basically electronic shutters, mechanical shutters are generally used on the side shaft. They are all primitive and retro things, and the chances of using them are not particularly great.

Finally, to answer your question, the cable for SLR will remain relatively stable, which is one level higher than the stability factor of manual shutter. Usually used to shoot night scenes, delay time, and then it's time to take selfies.

Ps, there are some models that can support APP remote shooting. For example, Canon's remote control can use the mobile phone as a wireless shutter. Of course, Sony's micro-single also has this function.