I don't think that we use it frequently since we are an EE/CS faculty, but our lecture halls have a steady supply of Nitrogen.
Rolleiflex SL66 medium format camera
Carl Zeiss Rollei-HFT Planar 2.8/80 lens
Kodak Tri-X 400 film
Scan from negative @4800dpi, downsized x0.5
View On Black 