Why would one want to shoot Ortho in the field? A blue filter with panchromatic film will do the same thing. This stuff can do nice tricks in the lab, though as you can safely handle it under red light.
Not quite true. Although this idea has been proposed over the past 30 or so years, the results of a blue filter with panchromatic film come close but are not identical to those of orthochromatic film. I never leave home without some of each loaded in holders, often Tri-X Ortho and HP5+. No, Tri-X Ortho is not available and has not been for many years. The ability of ortho films to open up the shadows is much superior to that of filtered pan films.
[FONT=Comic Sans MS]Films NOT Dead - Just getting fixed![/FONT]