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 (49mm 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 49mm Snap-On Lens Cap:
I bought these for my Pentax prime lenses. The slim size adds minimum size when packing my lenses in a lens case or bag, and the pro look is perfect on the classy Pentax prime lenses. Clip on action is strong but easy to release. Highly recommended.
Pros
Cons
Best Uses
Comments about B+W #310 49mm Snap-On Lens Cap:
I was looking for a snap-on lens cap for my Pentax DA Limited lenses which have gorgeously build metal lens cap, but not practical due to their screw-in design. There're many third-party 49mm lens cap choices available that I've tried, but I finally settle on B+W for all my Pentax Limited lenses (all of them share the same 49mm thread). This made-in-Japan B+W cap is really well-made, solid and has an expensive look/finish. The lens cap comes with exactly the same packaging as any B+W filter, which is excellent. It has no letters/brand name on the front (a great feature!), instead it has a really nice textured design which complements the rubber skin of most DSLR very nicely. The design of the front lens thread and lens hood of my Pentax DA 15mm & 35mm Limited lenses allows this B+W snap-on cap to work as it should with collapsed lens hood. So, the way I use it is: take off the cap, then extend the built-in hood. But if your lenses have fixed lens hood design, you should first consider how you'd like to use your lens cap. Because this B+W cap doesn't have 'center-pinch'-type of finger grip. If you don't use lens hood at all, of course there's no issue whatsoever. Highly recommended to consider.
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