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On my 645 TL Pro, there are two actuations that need to
be done in order to remove the prism. While looking down from the
top with the lens pointed to the front there are two buttons
that need to be pushed. The one on the right side first
needs to be pushed in and down. The left one needs to
be pushed towards the back of the camera. Replacing the prism
is done the same way. Enjoy your Mamiya.