DGK-BA Lens White Balance Lens Cap 77mm Snap On fits Canon Nikon Olympus Sony Sigma Easy to use - just snap on and balance! Secure fit for 77mm lens Canon, Sony, Sigma, Nikon, Tamron, etc. Replaces your regular lens cap - eliminates extra items to carry Perfect colors and neutral tonality with any light source Package includes one 77mm white balance lens cap with one dome.