Hi, in my UHD videos sometimes I can't make WB because I have not a sufficient free time. I use GH5 camera to shoot. Does anybody use a lens cap to do it?

I know there are some different lens caps on the market. If you use it, can you inform me if it works fine? I attach a link of one of them. Thanks

https://www.bhphotovideo.com/c/produ...e_Balance.html