These STUDIO VIEW FINDER COVERS are add-on components to the RS-55TX rain covers for studio configured cameras; ENG/EFP lenses (8"-12" long 20 cm-30cm ) with TRIAX adapters (No recorders attached) They are also used with our CUSTOM RS-5TX45,55,70X box or sports lens. Sometimes used with the Shoulder Case, Storm Coat and Camera Body Armor, too.