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If you have even a few lenses, filters and tinkered things missing here and there from time to time a lid. The parts listed fit with me super on all lenses. This is important because the lid "challenge cups" are with me and with each change of objective migrate to a different lens.

Build Your Own For the price I use sometimes a lid for handicrafts, especially for my macro experiments. For example, I have a cut and a 49mm Step Down Adapter purely stuck, so I can be mounted on the wrong side of the lens actually more filter (keyword retro position).