The 138mm approach lenses are the largest available on the market and serve the vast majority of optics in our catalog. They require a Parasol or Matte box with round cabinet of the same size to be mounted. You can visit our Parasoles section to see the options. You can also use 3D support to place the diopter as you need it best or use our range of split lenses to achieve excellent optical effects. We can offer you the Schneider and Tiffen brands.