I have been shooting 70mm outdated ektachrome all summer with no problems at all accept finding a lab to process 70mm E6. The film I bought from a proffesional who had a freezer full of the stuff from the late 80's and early 90's has been amazing. I use it in my Graflex Crown graphic with RH-50 film back. You get 50 plus shots with the RH-50 (6x7 format). I was skeptical at first but when I got that first roll back it blew me away, good color saturation and everything. It made me a big believer in freezing film.