Ring support for lens, it contains an aluminium ring, 3 nylon screws, one 1/4 inch screw Uniquely designed for the WeMacro rail! It can reduce vibration from mirror, especially with continuous light in high magnification. Inner diameter 104mm. With Canon MP-E65 (will need 2 pieces of quick release clamp without plate and 1 piece of 200mm quick release plate) The vibration is amplified at the front of the lens, so the support point is as far forward as possible.
