(Video in English, French and Spanish)

As mentionned online, Different lenses have different fields of views. To enable you to pick the best possible solution for your situation, we created this calculator. As you can see in the picture above, depending on wether you're zoomed (Tele) in or zoomed out (Wide), the captured image at the set distance has different dimensions. By filling out the distance between the camera and the object to be captured, you will be able to see if you're still able to get that close-up shot zoomed in or if you can still capture the full width and height of the stage when zoomed out. This calculator gives you the maximum and minimum width and height, all values in between these two are possible. 

https://avonic.com/lens-calculator/