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STEP 1: REMOVE THE FRONT RING
THE BELOW PROCEDURE APPLIES FOR F18, F21, F24, F28:
0 - Remove the front cap.
1 - Untighten the front ring screws with an adapted size Phillips screwdriver.
2 - Remove one by one each screws with cautious and securely using a pair of tweezers.
3 - Remove the front ring with the hands or a pair of tweezers.
TIP:
after removing the screws you can also take off the front ring by maintaining it and flipping the Optimo Prime upside down and catch the front
ring with the hands. Do not hold the lens by the rear cap.
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