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No, the lens twist is, at the required apature, say f22, push the depth of field button so the ap closes down, and at the same push the lens unlock button and at the same time twist the lens a few mm, say 5 untill the LCD display shows 00 apature. In auto you need to be in av mode so the exp time is auto. Select an ISO for reasonable exp times, iso doesn't Auto change. So the ap and iso are fixed and exp time changes. Manually change the iso as you go to keep exp times reasonable. At some stage when it gets darker and you've reached the max exp time you can have and the max Iso you can stand, twist the lens back on and switch to full auto or to tv mode ,to control max exp time, by setting the ISo to the highest you can stnd and manually change expoures times which will auto change ap. When the ap bottoms out, make sure the exp times are long enough for correct expoures untill you've reached the max exp time allowed (less than the period). Then you've hit a brick wall, min ap, max ISP and max exp time, after that let it go and the time lapse will just get darker if it's not already a full dark sky.
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