Can anyone explain how to fix focus at infinity on this lens? As no one has bitten I will add that this is for air displays. In the past with my nikons I set manual focus and infinity on the lens. Because it is marked and also because it is click stop it doesn't move, if it does I can easily see. With no markings or click stop on the fuji lenses I wondered if there was another way of doing it. I can't find any reference in the manual.