Quote:
Originally Posted by Paul Haese
Something you might not have thought about though is that doing this can lead to soft focus nearer the horizon with it getting progressively better as the system reaches the meridian. If the object does not make it very high at all then you could have slightly defocused images. Focusmax if set to focus at the Zenith will produce sharp focus every time, it does take time to do this but worth collecting sharp data.
Out of interest though CCDautopilot also allows focus within the same field if you want that. I prefer to have the scope go to the meridian for the best focus I can get.
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Interesting point here - but I find that the best focus position changes slightly due to flex and optics moving about in their cells from low altitude to zenith, which is why I prefer the SGpro method. Obviously going to be system dependent.
Cheers,
Andrew.