Also, before you do anything important, you'll want to compare results between Polaroid and the film you normally use. Even if the two films have the same box speed, for instance, reciprocity error will likely be very different. If you're in the studio using strobes, it won't be much of an issue, but if you use speeds even as slow as 1/2 sec. you might see color shifts or variances in exposure in the Polaroid, while there might be no correction required with a slide film like Provia 100F.