Yesterday we shot outside in sunny daylight with the BMPC4K and of course I couldn’t see anything on the touchscreen. (And we had no SDI viewfinder). Therefore I’ve quickly built a super duper viewfinder from a pizza cardboard. It looks really shitty but it works great! It is collapsible and has also a Swing-Away technology to easily access the touch screen 🙂
Heres the link to my PDF tutorial and DXF file if you want to build one too: bmpc4k_viewfinder