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Hello Charles,
Filter offsets are in the Focusing tab, and are visible once you have connected the filter wheel for the first time [see attached].
You need to have a base filter with a reference of 0 [zero], and off this filter you dial in the focus differences of each other filter relative to this base filter. The above example was with the Clear as base, and coincidentally, the Green was the same [its not always the case that filters are exactly par focal].
The number of the difference depends on your focuser movements.
Hope that helps a little.
Steve
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