An important accessory for the lens

This B & W 900 Rubber Lens Hood serves as protection against side light and at the same time also protects the lens. This diameter is 3.7cm so is very small and has a metal screw. The main material is made of rubber and is very flexible because it is foldable, which means you can put the rubber bead backwards. The first thing I did was on the rubber lens hood that I einpinselte the rubber together with the screw well with Ballistol oil. After drying, I wiped the rubber diaphragm
again with a dry soft cloth after. The screw could be so very supple and soft attach to the lens.
I also have some Metal guards in the analog photo time but I think the rubber lens hoods practical because they are not rigid and they kannn push back when they are stowed in the pocket.