I've one hard dust particle stuck to the prism. Blowing doesnt help. Wouldnt want to touch the prism so I managed to blow it to the lower part of the screen where it would less be visible on ground details and so. Focusing screen is clean either. Of course dust on focusing screen doesnt affect captured image but its highly annoying, needless to say that I had this problem with nearly all of my Pentax DSLR's, dust got between AF screen and prism after a short while.
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