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My tips re focus place some blue tack on the lens body and the focus ring so it does not move ...its so easy to bump it and you just dint notice and you think your focus was not grest when it may have just moved...also as mentioned be happy with the lens not zoomed all the way out.
And make a small dew cover so as to stop stray light reaching the lens.
I make mine out of stuff from Spotlight that looks like wet suit material..join with contact adhesive takes no time at all.
Alex
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