Mike wrote
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though the middle slot has no spring things to hold it in place, so it falls out easily
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Mike, my filters stay put in the middle slot no problem, the middle slot is spring loaded on mine although not the using same mechanism as the other slots. One of the main advantages of the P system is the ability to raise or lower graduated filters, something which is unachievable with circular screw in filters. One quirk of some of the canon lenses is that the front element rotates during focussing. The T adapter rotates in the P adapter to allow compensation for the front element rotation.