The essentials:

• Matching lens cap for the following S lenses:
• Elmarit-M 1:2.8/28 mm ASPH.
• Summicron-M 1:2/35 mm ASPH.
• Summicron-M 1:2/50 mm
• APO-Summicron-M 1:2/50 mm
• Macro-Elmar-M 1:4/90 mm