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For the vast majority of lenses, i.e. almost all lenses, a general lens cap would fit, as long as long as it had the right diameter. There are a few exceptions, e.g. ultra wide angle lenses that have a protruding front element, as e.g. in this question where you need a special lens cap compatible with the lens, but those are really special cases.


If the lens caps weren't compatible, filters also wouldn't be compatible. So yes, the thread specs are the same between lens manufacturers. Only the diameter of the filter mount / lens cap varies.

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