I woke up thinking about this, mostly because my 5X7 Elwood came with a reduction extension cone

A quick search showed APUG had this discussion in 2018 with many of our members giving great answers

A ?, is a reduction from LFPF definition of LF as 4X5 and larger still Large Format for posting images?

#2 ? are APUG links allowed on LFPF

Just in case not, use these words to find what I now know..........

massive reduction with enlarger

I will need to do this for contact printing Postcards