Hey. I would like to start doing some 'strobist' style work with my Mamiya 645, and I'm looking for leaf shutter lenses. I've noticed that they are not all that common, and when they are, they are quite expensive. I think I'm just going to go for one right now, and see how it goes. My choice right now is the 80mm or the 70mm. I'm wondering if anyone can tell me which they think is better? Thanks.