The 52 mm original Pentax lens reversal adapter does not rotate fully into the Makinon macro extension tube and hence does not lock into position. Photos of both are shown below. Please note the positions of the round pin in the lens reversal adapter and the flat pin in the macro extension tube - around 7' o clock.
The Pentax AL II kit lens mates perfectly with the Makinon macro extensin tube.
The round pin cannot move as it is fixed in the adapter body. I have a feeling the flat pin cannot move past the round pin and hence the locking pin in the Makinon cannot mate with the slot in the Pentax adapter.
Now I am afraid to mount the Pentax adapter in the K20D or the Makinon macro tube lest they damage the more expensive camera.
Request help as many of my Pentaxian friends will be owning these accessories.
Note: I noticed a similar round pin recessed inside the mount slot of the Kit Lens. I tried moving this pin with a strong wooden tooth pick, but the pin would not budge. I wonder what this pin is for? The flat pin on the lens moves the aperture.
Last edited by nanhi; 06-29-2011 at 08:09 AM.