I recently picked up a few boxes of MACO 820c Infared film in 11x14 size. However, I have never shot with infared film before...so I need some suggestions to get me started. First off, I need to know what speed to rate the film at, and what filter is recomended to use with this particular film. Second, I remember learning you need to change your focus when shooting with infared film. Well, using an 11x14 camera...how do I know how far to shift the focus? Finally, I'm using Pyrocat-HD as my standard film developer, will that be okay with this film? Loading/unloading, carrying and storing the film...any difference front normal film? Any other suggestions for using infared film in LF and ULF sizes would be helpful. Thanks so much!