Sony ALC-F55S 55mm Front Lens CapSony ALC F55S Overview Make sure your 55mm diameter lens has its front element protected when not in use with this replacement ALC F55S 55mm Front Lens Cap from Sony. This cap features a center pInch snap on design for ease of use and reliability. Key Features for 55mm Diameter Lenses Protects Front Element of Lens Center PInch Design Replacement Part Sony ALC F55S Specs Type Front Size 55 mm Attachment Method Snap On Packaging Info Package Weight 0.