I need an optical element that when rotated will rotate a video projection.
Someone on reddit suggested dove prisms. I have no experience with them so although I found few illustration videos from thorlabs and few suppliers, I would still like to have an idea which one I should try out and if my expectations can actually be met.
https://www.youtube.com/watch?v=lMyuHy9WZGM
I only found one video that maybe does something similar: https://www.youtube.com/watch?v=Jvv22wI3qY0
It is my understanding right now that the faces where the beam goes in and out of have to be big enough to fit the projection beam diameter.
Not sure if this is all I need to consider.
I would like to know for example, if the beam can reflect inside the prism and still look fine as long as it isn't clipped coming out from the other face.
BTW, it doesn't have to be a dove prism, if there are other less known prism types that can do this or other not expensive optical components those also may work so please mention them. Dove prisms have one disadvantage for example for my use case, which is one full rotation causes double beam full rotation so I'm open to other ideas.