So I am starting to shoot some Rollei IR400 in 4x5 with my standard R72 filter, using a 90, 135 and 180mm lens. For the next week, I will be using my existing Toyo 45CF, then a Chamonix 45N-2 that might get here as early as this week. I use this film regularly in 120 with a 501C/M to great effect, use the IR focusing marks on the CF lenses. But I shot two holders of it today in 4x5 and forgot to back off the focus since there is no IR compensation mark. Generally use F/16-32 on my lenses along with some tilt on landscape images, so what are people doing if anything in terms of focusing for IR film in large format? Also, with a film like Rollei IR400, do I not need to worry about the bellows as much as say, HIE? What's the word?