The Canon Drop-In Gelatin Filter Holder 50 (WIII) offers a simple solution for you to use cut gel filters with select Canon super-telephoto lenses that do not have filter threads, such as the Canon EF 400mm f/2.8L IS III USM lens, and the Canon EF 600mm f/4L III USM lens. The Canon Drop-In filter holder is used to hold your gels in the rear of the lens, and it is easy to install and remove. The gels are held in place by a clamping mechanism.
Prop65 WARNING: This product may expose you to chemicals which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.