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Re: sigma macro lense
If it doesn't turn correctly, that strongly indicates you didn't reassemble the lens properly. Take it apart and try again. And I hope you have a lens collimator and other tools to ensure you get the lens elements aligned properly.
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This lens is not a true macro lens. It provides a magnification of 1:2 only, while true macro lenses provide 1:1 (life-size)magnification. So you won't be able to do very close macros with this lens. This lens has a Macro switch to enable you to switch to the Macro or normal mode.
First, turn off the Macro setting. That's for close subjects, not far ones. With it on, the lens will not focus past a certain distance.
Second, the camera doesn't know whether you're taking a picture of some bushes or of a fox. In this case it's going to have a tendency to focus on the nearer object. So, turn off the autofocus and focus manually.
(From Sigma lens literature) Capable of macro photography, this
lens has a 1:2 maximum close-up magnification at the 300 mm focal
length. It's the ideal high performance lens for portraits, sports
photography, nature photography, and other types of photography that
frequently use the telephoto range. It also has a switch for changeover
to macro photography at focal lengths between 200mm and 300mm with a
maximum close-up magnification from 1:2.9 to 1:2. The minimum focusing
distance is 1.5m / 59 in. at all zoom settings.