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What is the max. exposure time when using an iOptron Pro mount with a EOS 70D & telephoto lens?
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OK, I've finally managed to readjust the counterweight and got fairly good results up to 4" exposure time: The outcome still isn't perfect, but at least a significant fraction of the frames I've made ...

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Gray, banded sky in Luminance HDR output
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I suspect the tree branches to be the culprit: They tend to move (if there is some wind) from pic to pic, and the alignment algo (at least not Hugin used by Luminance) can't cope with this issue. It's ...

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