Usage of "all this"

[TadasN]

Hello,

I would be grateful if you could tell me if I am using "all this" correctly. The sentences:

Later, I realized that an environment, background and lighting are even more important. All this makes photography truly challenging.

As you see, here I use "all this" for multiple items, but "all this" is singular itself... I guess such a usage is correct, but would like to know if it really is. Thank you very much in advance.

Regards,
Tadas

[riquecohen]

Welcome to the forum, Tadas.

You've used "all this" correctly. It's a set phrase used for a collection of things.

[TadasN]

Thank you very much!