The German 9x12 format is definitely large format, the modern film holders are identical in outwards appearance to 5x4 dark-slides, the only difference is internal.
Older pre-WWII 9x12 cameras where often sold in the UK and US/Canada with Quarter plate holders, same film width just not as long/tall.
So Quarter plate is boreline Large Format, however film's only available on the Ilford ULF order so expensive, where as 9x12 is still a standard size sold on the Continent.
I've made an adaptor to allow me to use a Graflex RF back with my Quarter plate Houghton, this just slides in like a plate holder.
Ian
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