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Bit of a clue as there's nothing really in the photo to give scale. This entrance passage is smaller than Eglwys Faen or Chartist's but larger than Siambr Ddu or Pwll Swnd.
Worth a visit - make sure you crawl through the choke to take a look at the beautiful green pool that is the highest sump in Wales! It's only a short cave but the walk up (as long as the weather's good!) and a visit to the nearby Ogof y Garimpeiros too, make a good day out.
Pretty sure I know where your photo is but I'll give others a go.