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Hi Paul, as I usually use the Tak for imaging, the focus is mostly there all the time, by this I mean, other than a temp change while it is idle, the focus is not moved from the last imaging session, so therefore I expect that it would be very close to focus for the next session.
However on this occasion, although i did not alter the focus, i did have the camera off, and re attached it last night, so therefore it would not be in the same place as last time, and i also move its orientation.
So i realise that i would have to take new flats for the next session of images.
Now that the camera is back on, and the sensor is air dusted I will do another batch of flats tonight, and see how that goes.
Dennis I understand what you have described, and thank you for your very well described information.
Leon
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