Fujifilm 250/4 in 830 nm infrared on GFX 50R

I put a B+W 830 nm lowpass filter on my LifePixel-modified (720 nm option) GFX 50R and checked for hot spots on distant scenery with a +100 contrast boost.

Well, that’s encouraging. How about with the Fujifilm 1.4x telextender?

Not good at all. Hotspots at every aperture.