I have a 90mm f1.9 Dallmeyey oscilloscope lens it'll just cover 645 at Infinity, it's designed for cose-up work but sharpness/definition isn't critical particularly at the corners.

I use mine as a loupe, and the shutter a Prontor Press has been swapped for something more useful.

It's worth trying for some extreme experimental close ups, don't expect too much but it might be interesting.