The B+W Snap-On Lens Cap #310 model has two spring-mounted claws at opposite sides which attach to the inside of the filter or lens threads. They work on any lens or front-threaded filter with the filter size that matches the size you see here (46mm in this case). If you have a filter on your lens which has no front threads, you would instead need a B+W #305 model cap.
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Comments about B+W #310 46mm Snap-On Lens Cap:
This cap seems to be constructed better than the Lumix caps that came with my lens. I like the retro-looking leather grain finish on the front too. It works well so there's not much else to say. I feel it's worth the money.
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Comments about B+W #310 46mm Snap-On Lens Cap:
Does its job and works perfect for lens and filter protection. Item is made in Japan.
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Comments about B+W #310 46mm Snap-On Lens Cap:
It works even better than the original Panasonic one. It fits tightly into the lens.
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Comments about B+W #310 46mm Snap-On Lens Cap:
I purchased this to replace a lost Panasonic 20mm cap. This cap has a very tight fit, and does not come off easily without squeezing the release tabs. Each release tab has its own metal spring... no cheap plastic "spring" found in some of my other caps. The front of the cap has a fake leather grain to it. It's was only $2 more than the cheaper cap on B&H, so why not!
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