This Seagull right-angle viewfinder offers great flexibility of camera angles for my Canon 5D Mark II, but only when shooting stills. Solidly made with 1x and 3.3x viewing magnification, 360-degree rotation, click stops at 45-degree intervals, and an adjustable diopter eyepiece.
Lens Construction: 9 elements in 5 groups, high quality glass roof prism. It’s sharp, lightweight, inexpensive (about one-third the cost of the equivalent Canon product), and includes the unique Usage Manual below.
Too technical for me but I’m sure it helps your fellow videographers.
It was good that you included the usage manual. Keep the articles coming; they are great.