External camera screens, also known as field monitors and recorders, give you a big picture view so you can sort out minor issues before it’s too late to re-shoot. Of course, most modern mirrorless and DSLRs cameras offer built-in screens to view and compose your image. But at 3 inches as an unclaimed standard across the industry, most of the screens are lackluster in their viewing experience.

https://photographypx.com/best-external-camera-screen/

Video
https://youtu.be/xB3tf0j05es