I've been asked to video/photograph an HO model train set with my 5DmkII. I'm going to need to rent a lens to get it done, though, as I don't think my 50mm f/1.4 is up for the job. I'm guessing some kind of tiltshift lens with a fairly short focusing distance, if there is such a thing, but I have no idea in what focal length would be best. Thoughts?