The lens support is an essential component for any rig with a long or heavy lens.  It securely mounts to the front iris rods and is easily adjustable up and down. A long 1/4-20 captive screw with an aluminum knob runs through the post and allows you to remove your lens without removing lens support or changing its adjustment.  The lens support is comprised of the Rail Block Ultra-light, an Accessory Mounting Block with counter-bore and the Accessory Mounting Post with captive screw. They are available with either a 1 1/2 inch or a 2 inch post depending on your configuration. Many other combinations can be created using different Berkey System components.