Thanks for all the helpful information. I should have mentioned in my first post that I'm a novice when it comes to cinematography and am not familiar with a lot of technical terms. I've just gotten to the point where I want to see if I can make some of my digital camera videos appear more as though they were shot on film, but there doesn't seem to be any software that does a good job at that - at least none that are affordable. A few instructional videos on youtube showed some before/after examples of video that had supposedly been edited in this way, but honestly, I could barely make out any difference.
And of course ideally I'd still prefer to use a genuine movie camera rather than 'cheat' with special software anyway, but I will take into account all those things you cautioned me about.