Has anyone else had this situation? While using some beefy lenses on my Letus 35 FE (135mm, 200mm), even with a Cavision riser, the weight of the lens loosens the body of the Letus from the threads a little. Also, especially with the 200mm, adjusting the focus ring sometimes turns the entire Letus body causing that annoying vignetting in the corners. I'd love to hear any solutions.
