I use .5 so far. But want to try .42 I like to go closer. But the most important - I have new camera (canon rebel) and I want to buy also widerange for the canoc too. But I want both (video-camera and canon) to get good shoots together (as they are at the same distance from the tandem). Don't want to get good video of the tandem while the pictures taken will be too small or too large. So I am looking for the answer how to combinate both lens....