I apologize if this question has been asked before. But is there a source that tells what to set the HVX lens at to be equivelant to specific 35mm focal lengths? For example, say I was using an HVX/Letus/Nikon 50mm lens. Then I wanted to keep the exact shot but wanted a deep DOF, so I took off the Letus, what would I set the zoom on my HVX lens to be eqivelant I the 50mm lens?