Leica Genuine Hood Cap Leica Lens Hood cap E39 ・ITDOO ・IROOA ・IUFOO ・12585 This cap is ideal for storing E39 lens hoods. Also recommended for those who want to protect the lens even when the lens hood is attached. I personally prefer it to the slip-on type because you can still see the lens hood's engraving. The uniformity of using genuine parts is also nice. However, unlike the slip-on type, there's no worry of it coming off, but please note that it cannot be attached if you have a lens filter on. The hood cap itself is Φ42mm. Images 5 and 6 show the cap attached to an IUFOO (12575N). Leica products tend to become more valuable over time. Please consider this item. Thank you for looking.