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Don't use the diagonal. The ED80 comes with a screw threaded adapter which will screw straight on to a threaded T ring adapter for the camera (No Lens). I don't use the stock one as it's a bit crappy, Bintel sell an orion adapter for around $60, if money's tight other dealers have similar items cheaper. The Orion part is a Prime Focus Camera Adapter 2" and if you don't already have one you'll need a T adapter for the Pentax.
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