alternate lens hoods for RF 100-500 and or 70-200 z

[ronbyram]

Hello gang, first I know canon has these white lenses hoods designed for the RF 100-500 and 70-200 lens. But I dislike these larger white hoods.
But my question is can an older Black EF hood be used instead? Has anyone done this?

 

[danfaz]

I have used the hood from the 70-200 f/4. I know it's still white, but it's a good deal smaller.

 

[neuroanatomist]

With rare exceptions (such as the original version of the EF 24-70/2.8L), lens hoods for zooms are only maximally effective at the wide end of the zoom range. In terms of what a lens hood is intended for, namely to improve images by reducing flare and increasing contrast, using a shorter hood than the one Canon provides with (or recommends for) a given lens reduces the utility even at the wide end.

I suppose if your only goal is to have some additional physical protection for the front of your lens, using a shorter hood would still provide that.