The Tominon lenses for the Polaroid MP-4 are not the standard
39mm enlarger threading, but somewhat larger. I wanted
to use these lenses in the darkroom as well, I've got a set.
Particularly the 135mm/4.5 Tominon as I didn't want to buy
a 135mm since I already had one. So, on removing the
plastic mounting for the MP-4, the shutter itself is threaded
for 39mm! I've got the single mount, not the multi-mount,
on the SuperChromega. The MP-4 shutter/lens just fits
but I had to replace the thumb screws with threaded screws
to make it fit.
So now I got a shutter with macro lenses on the enlarger.
Useful enlarging lenses particularly the 75, 105 and 135mm.
Polaroid made a few enlarging heads for their MP-4, but
only a few hundred back in the day.
