I've got a Polyfocus 4x5 Viewfinder made by TEWE for MPP in England. It looks like it is supposed to mount in an accessory shoe. There is an adjustment on the mount that seems to correct for parallax by tipping the viewfinder. There is a zoom function marked from 90mm to 360mm with a red and black reference mark. I'm assuming the red mark is for IR but that's a guess. The front element has a mask that represents 4x5. The element rotates to move the mask from portrait to landscape. Does anyone know what this was made for? I use it to preview lens view. Does it have any contemporary use.
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