I just received a very nice Mamiya C330 F with the prism and absolutely love it so far. My only concern however is the screen. With the prism it's manageable, but a bit dim. I've researched the Beattie screen and I see it's advertised as 2 to 2 1/2 stops brighter. That would be great! Does anyone have the Beattie screen for the C330? $220 is a lot to drop on a screen for a camera that cost me $300. Thanks for any comments.