I tried to create a preset that shows an F-Stop number in the corner. The F-Stop number is shown by a text layer, and source text is controlled by a slider control. I created an expression (see below), that partly works, but I think it’s too complicate. I used 10 F-Stop values: F1, F1.4, F2.8, F4, F5.6, F8, F11, F16, F22 and CLOSE. My goal is: if the slider value is equal or more than 0 but less than 10, the F-Stop value is F1. If equal or more than 10, but less than 20, in this case the text shows F1.4, ect.