What is an upgrade lens?

Upgrading the lens is a technical means in film photography. The shooting standard of cinematography is 24 frames per second, that is, 24 frames per second, so that it can be a continuous picture with normal speed when showing. However, in order to achieve some simple techniques, such as slow motion effect, it is necessary to change the normal shooting speed, such as higher than 24 frames per second, which is an upgrade, and the screening effect is slow motion.

If you slow down the shooting speed (below 24 frames per second), it is degraded, and the screening effect is fast action. The same content shot by 1 sec, it takes 2 seconds to play the original content shot by 1 sec after upgrading to 48 frames, so you will feel slow motion when watching it.