Not for points English to Turkish Other Other \"still form\"

Here is the paragraph this term is in:

A photographer can work on a wide variety of subjects including events, still form, portraits, architecture, and landscape (to name a few). While this can be a staffed position, more often than not photographers are independent contractors. Aside from capturing images, a photographer is responsible for the editing and retouching of photos and digital images.

What is the English explanation of the term "still form" and how can it be translated into Turkish?

I am open for English explanations from linguists whose mother tongue is English, too.

Thanks for your contribution in advance.