which is a close to $4,000 lens and I wasn't even sure if it would change the aspect ratio by itself or not.....and I wouldn't want to rent it if it doesn't work like I want it too....I have to travel out of state for this shoot so I don't really have a chance to reshoot it down the road...
Eros Salvatore (another victim of creative cow's "real name" policy")
Why in the heck would you do it in camera? You're not getting anything out of it. Just tape the lcd screen so that you frame correctely and then crop it in post. There is no way to do it in camera and those lenses (whilst very nice) will not change the ratio.