The Leofoto SF-03 lens foot is an improved version of the tripod lens collar for the Sony FE 400MM F/2.8 GM lens and the Sony 600MM GM F/4.0 GM lens. The foot is made of durable and strong aluminium and is Arca-Swiss compatible. With this foot, it is no longer necessary to place a quick release plate under the tripod tripod lens collar. By replacing the complete Sony foot with the Leofoto foot you also reduce the weight of the construction and maintain the low profile. The Sony foot is easy to replace by this strong aluminium Leofoto foot that offers excellent stability for your lens.