The filters used for IR are the same for LF as they are for 35 mm. My main hurdle was getting used to how to treat the Maco IR film. It's much slower than the Kodak IR film and you can't really use any filter beyond a Wratten 87 with it. I shot the Maco in 120 size and took copious notes on what I was doing before moving up to 4x5 & 8x10 IR. If you are looking for some exercises, try Hugh Milsom's book, Infra-Red Photography. However, he really doesn't get into the Maco films all that much, nor does he do LF IR. I don't make any focusing corrections for the IR filter. I take into account the filter factor when I meter. I'm stopping down considerably for my shots and the results are good enough for me.
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