I stumbled upon this „Lupenobjektiv“.
It has a reduced focal distance and is usually used with a macro tubus.
Schneider : Lens for high resolution, up to large format macrophotography; used with Copal 0 shutter and special macro tube for Linhof Technika. Also ideally for 35mm on bellows.
Another user tells me it covers 8×10, I have still to try this.