This Leica 95mm Front Lens Cap for S-Series Lenses is a replacement cap for Leica S-series lenses that feature a 95mm filter thread, including the Leica 30-90mm f/3.5-5.6 Vario-Elmar-S ASPH. Lens and the Leica 24mm f/3.5 Super-Elmar-S ASPH. Lens. It is a center squeeze and snap-on type lens cap. Keeping the lens covered when not in use will protect it from dust, scratches and finger smudges and having a spare lens cap is a good idea, if the original is lost while on vacation of assignment.