Fotodiox Pro Yoke Lens Support - Universal Telephoto, Long Lens Support Bracket for 15mm Rod System with Height Adjustable Trimmer Knob Features a trimmer knob for easy, quick and accurate vertical adjustment, 35mm of vertical adjustability Provides additional support for wide angle and especially long telephoto lenses Compatible with any standard 15mm rods system; a great compainion to the Fotodiox Pro WonderRig Elite Lets a telephoto rest gently and securely upon it, rubber-coated 'Y' dampens and eliminates vibration 24-Month Manufacturer Warranty